How to Knit a Double Folded Collar: A Complete Step-by-Step Guide
There’s something undeniably satisfying about finishing a sweater or cardigan with a beautifully knitted double folded collar. It sits cleanly against the neck, adds a polished, structured look to any garment, and — once you understand the technique — is far more approachable than it might seem. Whether you’re a seasoned knitter looking to refine your finishing skills or an intermediate knitter ready to tackle something new, this guide walks you through everything you need to know to knit a double folded collar from start to finish.
What Is a Double Folded Collar in Knitting?
A double folded collar, sometimes called a double-layer collar or turn-back collar, is knitted so that it folds over itself to create two layers of fabric. The inside layer sits flat against the neckline and is typically sewn down or picked up directly from the garment’s neck edge, while the outer layer folds back to display a clean, finished edge without any visible bind-off or seam.
This construction method has a few key advantages. First, it eliminates the harsh appearance of a traditional bound-off edge at the collar’s tip. Second, it provides extra warmth because the doubled fabric adds insulation around the neck. Third, it gives your finished knitting a professional, garment-style appearance that elevates handmade pieces to something that looks truly crafted.
Double folded collars are most commonly seen on classic wool sweaters, cabled pullovers, children’s cardigans, and even structured knitted jackets. They work beautifully in both sport and worsted weight yarns and can be adapted to almost any neckline shape.
What You’ll Need Before You Begin
Before casting on a single stitch, gathering the right materials makes the entire process smoother. Here’s what you’ll need:
Yarn: Choose a yarn that holds its structure well. Wool or wool-blend yarns are ideal for a double folded collar because they have memory — they spring back into shape after being worn and washed. If you’re working with a purely acrylic yarn, make sure it has some body and isn’t too limp, as floppy collars tend to lose their shape after the first washing.
Needles: You’ll typically need two needle sizes. Work the outer layer of the collar on a needle one or two sizes smaller than the main garment needle. This slightly tighter tension keeps the folded portion from flaring or gaping. The inner layer, which folds underneath, can be worked at the same gauge as the garment or very slightly looser to ensure it lies flat without pulling.
Stitch markers: These are essential for keeping track of where your neckline sections begin and end, especially when picking up stitches around a curved neck edge.
A tapestry needle: You’ll need this for sewing down the inner collar edge on the inside of the garment once you’ve completed knitting.
Blocking equipment: A spray bottle, pins, and blocking mats help immensely in shaping and setting the collar once it’s finished. Blocking transforms a lumpy, uneven collar into something crisp and wearable.
Understanding Gauge and Collar Depth
Gauge matters for collar knitting just as it does for any other part of a garment. If your collar is meant to sit at a specific depth — say, two inches of roll-back — you need to knit the total collar length at roughly double that measurement before folding, since half of it tucks behind.
For example, if your pattern calls for a finished collar depth of two inches, you’ll knit approximately four to four and a half inches of total collar length. The additional half inch accounts for the slight take-up at the fold point and ensures the inner layer tucks neatly without shortchanging the outer appearance.
Always swatch before beginning. Even if you’ve knitted the body of the garment at the correct gauge, switching needle sizes for the collar can throw things off unexpectedly. Knit a small swatch in your collar stitch pattern, wash and block it, and measure before committing to the full collar.
How to Pick Up Stitches for the Collar
Most double folded collars begin by picking up stitches around the neckline of a finished garment body. This is the foundation of the entire collar, and doing it correctly is crucial for a clean, even result.
Step 1: Prepare the neckline. If your garment has been bound off at the neck, you’ll pick up stitches from the bound-off edge. If your pattern directs you to leave stitches live on a holder, you’ll simply transfer them to your needle. Either way, block or lightly steam the neckline before picking up stitches so the edge lies flat and picking up is consistent.
Step 2: Calculate your stitch count. Your pattern will usually specify how many stitches to pick up, but if you’re improvising, a good general rule is to pick up three stitches for every four rows along vertical edges and one stitch for every stitch along horizontal (bound-off) edges. For curved edges like the front neck shaping, a ratio of about two stitches per three rows works well.
Step 3: Pick up evenly. Using the smaller of your two needle sizes (since you’ll begin with the outer collar), insert the needle tip under both legs of a stitch on the neck edge, wrap the yarn around the needle, and draw a loop through. This creates a neat, secure pickup stitch. Work all the way around the neckline, placing stitch markers at the shoulders and at the center front and back if helpful.
Step 4: Check your count. Before knitting even one row, count your stitches and confirm the total matches what your pattern specifies. Adjustments are far easier now than after several inches of collar have been completed.
Knitting the Outer Layer of the Collar
The outer layer is the visible, showpiece portion of your collar — the part people will see when you wear the garment. Because it folds back and outward, you’ll be looking at the wrong side of this knitting when the collar is folded in use. This is a detail that catches many knitters off guard.
Choosing your stitch pattern: For a clean, reversible collar, stockinette stitch works well — but since stockinette wants to curl, make sure you have enough length in the outer layer to lay flat once folded. Ribbing (1×1 or 2×2) is another popular choice because it lies flat naturally and adds stretch for easy wearing. Seed stitch produces a beautifully textured, non-curling fabric and is particularly lovely for a folded collar on a classic wool sweater.
Working the outer layer: Beginning with your smaller needle, work the collar in your chosen stitch pattern for the total outer-layer length specified. For most standard collars this is somewhere between two and three inches, but adjust according to your pattern’s instructions.
Maintain consistent tension throughout. Collars knitted in the round (which is common for crew and turtleneck styles) should be worked with extra care at the join to avoid a visible ladder.
Increasing for a notched or stand-up shape: Some double folded collar designs call for subtle shaping — a few strategic increases near the beginning of the collar that allow the outer portion to flare slightly and fall gracefully when folded. If your pattern includes increase rows, work them as instructed, typically at even intervals during the first third of the outer layer’s length.
The Fold Point: Marking the Turning Ridge
The turning ridge is the single most important detail in a double folded collar. It creates a clean, defined fold line that separates the outer layer from the inner layer.
The most common method for creating a turning ridge on a stockinette collar is to purl one round on the right side of the work (if working in the round) or knit one row on the wrong side (if working flat). This creates a single reverse-stockinette row that naturally wants to fold inward, giving you that crisp, clean line.
For a ribbed collar, you can simply reverse your rib pattern for one row — knit the purls and purl the knits — to create a gentle fold ridge.
Another option is a yarn-over turning ridge, which creates a row of small eyelets along the fold line. This is a decorative choice that works beautifully on lacy or feminine garments but may look out of place on a structured, classic sweater.
Once you’ve worked your turning ridge, place a removable stitch marker or a small piece of scrap yarn looped around this round as a reference point. You’ll come back to it when it’s time to sew down the inner collar.
Knitting the Inner Layer
The inner layer is knitted in exactly the same way as the outer layer, mirroring its stitch count and length. The primary difference is needle size: switch to a needle one size larger than the one used for the outer layer. This gives the inner layer slightly looser tension, which allows it to lie flat on the inside of the neck without pulling or bunching.
Work the inner layer in stockinette (regardless of what stitch you used for the outer layer), since the inside of the collar doesn’t need to be decorative — it just needs to lie smooth and flat.
Once the inner layer reaches the same length as the outer layer, you have two choices for finishing:
Option A: Bind off and sew. Bind off the inner layer loosely — use a needle two sizes larger than your working needle if necessary to ensure the bind-off doesn’t pull tight. Then fold the inner layer inward along the turning ridge and whipstitch or slip-stitch the bound-off edge to the inside of the garment’s neck. Use a tapestry needle and matching yarn, keeping your stitches small and invisible from the right side.
Option B: Three-needle bind-off. If you left the garment’s neck stitches live on a holder before picking up for the collar, you can fold the inner layer inward and use a three-needle bind-off to join the live stitches on the inner layer to the live stitches at the neckline simultaneously. This creates an even cleaner interior finish with no sewing required, though it does require a bit more planning at the beginning of the project.
Sewing Down the Inner Collar
If you’ve chosen Option A above, here’s how to sew the collar down neatly.
Thread a tapestry needle with a length of the same yarn used for the garment (or a closely matching yarn in a thinner weight, which creates less bulk). Fold the collar along the turning ridge so the inner layer faces the inside of the neck.
Working on the inside of the garment, use a slip stitch or whipstitch to secure the bound-off edge of the inner collar to the neck seam or to the base of the picked-up stitches. Insert the tapestry needle under one strand of yarn from the collar edge, then under one strand of yarn from the garment’s neck, and pull through gently. Don’t pull too tight — the goal is a secure attachment with no puckering visible from the right side.
Work all the way around the neckline, checking the right side periodically to ensure the collar is lying flat and your stitches are invisible. Once you reach the start point, weave in your yarn end securely.
Blocking Your Finished Collar
Blocking is the step that separates a handmade-looking collar from a professionally finished one. Even if the collar looks relatively good off the needles, blocking sets the stitches, evens out any tension inconsistencies, and gives the fold a clean, permanent crease.
For wool and wool-blend yarns, wet blocking is most effective. Fill a basin with cool water and a drop of wool wash. Submerge the finished garment (with collar attached) and allow it to soak for at least twenty minutes. Gently squeeze — never wring — the water out, then press the garment in a clean towel to remove excess moisture.
Lay the garment flat on a blocking mat. Smooth the collar into its folded position, pinning the fold edge if necessary to hold the turning ridge in place. Allow it to dry completely before removing pins — this usually takes twelve to twenty-four hours depending on your climate and yarn weight.
For yarns that shouldn’t be wet blocked, use steam blocking instead. Hold a steam iron a few inches above the collar surface and direct steam across the fold line. Do not press the iron directly against the knitting, as this can flatten the stitches and damage the yarn’s texture.
Common Mistakes and How to Avoid Them
Even experienced knitters run into trouble with folded collars occasionally. Here are the most common pitfalls and how to sidestep them.
The collar flares outward: This usually happens when the outer layer has too many stitches or is worked at too loose a tension. Try working the outer layer on needles one size smaller than initially planned, or reduce the stitch count by two to four stitches if your collar is significantly flaring before the fold.
The collar pulls tight at the neck: This is the opposite problem — the inner layer is too tight, pulling the whole collar inward. Switch to a larger needle for the inner layer, or work a few extra stitches into the inner layer to give it slightly more circumference than the outer layer.
The turning ridge is invisible or weak: If your fold line disappears into the collar, the turning ridge row may not have enough contrast in the stitch pattern. Try working two rows of reversed rib or two purl rows instead of one to make the ridge more defined.
The bound-off edge shows on the right side: This means the inner collar was sewn down too loosely or the sewing stitches are catching the wrong layer. Rip out the sewn edge and redo it, making sure to catch only the innermost strand of yarn on both the collar edge and the neckline.
Tips for Adapting the Technique to Different Necklines
A double folded collar can be adapted to suit most standard neckline shapes with minor adjustments.
For a crew neck, the collar is typically worked as a short fold — one to two inches of finished depth — and sits close to the neck. Pick up stitches evenly around the entire neckline and work in the round throughout.
For a V-neck, things get slightly more complex. You’ll need to miter the collar at the V-point by working short rows or decreasing symmetrically to shape the collar so it follows the V cleanly when folded. Increasing the stitch count near the collar’s sides and decreasing at the V-point keeps the collar from puckering or gaping.
For a boat neck, the collar is often very shallow — just a hint of fold at the neckline’s edge — and is most elegantly worked in a fine yarn on small needles for a delicate, understated finish.
For a turtleneck collar, the principles are exactly the same, just extended: the total collar length before folding might be eight to twelve inches, and the fold sits mid-collar rather than at the neck edge. Pay special attention to needle sizing here, as a long turtleneck has more opportunity to flare or pull noticeably than a shorter collar.
Final Thoughts
Knitting a double folded collar is one of those techniques that seems complex at first glance but reveals itself to be quite logical once you break it into parts. The outer layer, the turning ridge, the inner layer, the sewing — each step builds naturally on the last, and the result is one of the most refined, satisfying finishes in all of garment knitting.
Take your time at each stage. Check your gauge, swatch if in doubt, and don’t rush the blocking step at the end. The extra care you put into a collar is immediately visible in the finished garment — it frames the wearer’s face, sits at eye level when you’re standing across from someone, and is often the first detail people notice and compliment.
Once you’ve knitted your first double folded collar and felt that clean, crisp fold fall perfectly into place, you’ll find yourself looking for excuses to add one to every sweater you make.
