Double knitting creates a reversible fabric with two colors on opposite sides

Double knitting is a method where you work with two yarns at once to build a fabric that looks different on each side. One color appears on the front, the other on the back, and they swap places if you flip the piece over. The result is a thicker, warmer fabric than single-layer knitting, and because both sides are finished, you can wear the piece inside-out without it looking unfinished.

The basic principle is straightforward: you knit one color while holding the other color in reserve, then switch. On each row, you alternate which yarn is active. The two yarns stay separate inside the fabric rather than mixing, which is why the colors stay distinct and the piece stays reversible.

Double knitting works best for scarves, blankets, and garments where the extra weight and insulation matter. It uses roughly twice as much yarn as regular knitting because you are carrying two strands throughout, so plan your yardage accordingly.

Key Takeaways

  • Double knitting uses two yarns held separately to create a reversible fabric with one color on each side.
  • You knit with one color while holding the other loosely, then switch colors on the next row, keeping the unused yarn on the inside.
  • The finished piece is thicker and warmer than single-layer knitting and looks finished on both sides.
  • Double knitting requires roughly twice the yardage of regular knitting, so check your yarn supply before starting.
  • The most common cast-on for double knitting is a two-color cast-on that sets up both yarns at the edge in a balanced way.

Setting up your yarns and needles

Start with two yarns in contrasting colors. They should be the same weight so they knit at the same tension. Wind each into a separate ball or use two balls from the same skein if your yarn comes that way. You will hold both yarns at once, so having them organized prevents tangling.

Use needles one or two sizes larger than you would for a single strand of the same yarn. Double knitting fabric is naturally dense, and slightly larger needles keep it from becoming stiff. If your yarn calls for US 6 needles, try US 7 or 8 for double knitting.

The two-color cast-on is the standard starting point. Cast on using both yarns together, alternating which color you use for each stitch. If you cast on 20 stitches, stitches 1, 3, 5, and so on belong to color A, and stitches 2, 4, 6 belong to color B. This setup ensures both colors are balanced at the edge and ready to work.

The knit row: working both colors

On your first row, you will knit every stitch, but you will only use one yarn at a time. Hold color A in your right hand and color B in your left (or whichever hand feels natural). Bring color B to the front of your work, slip the next stitch purlwise, then take color B back. Now knit the next stitch with color A. Repeat this pattern across the row.

The slipped stitch is the key move. You are not knitting it; you are moving it from the left needle to the right needle without working it. This keeps the unused color on the inside of the fabric where it belongs. The stitch you slip belongs to the other color and will be worked on the next row when that color becomes active.

After you finish the row with color A, you have slipped all the color B stitches. On the next row, you reverse: bring color A to the front, slip its stitches, and knit with color B. The pattern alternates row by row.

Purl rows and maintaining tension

Purl rows follow the same logic as knit rows. Bring the unused color to the back, slip the stitch purlwise, bring it back to the front, then purl with the active color. The direction changes because you are purling instead of knitting, but the principle stays the same: slip the stitches that belong to the other color, work the stitches that belong to your active color.

Tension is critical in double knitting. The slipped stitches should be snug enough that they do not gap, but not so tight that they distort the fabric. Aim for even tension on both the knit and purl sides. If one side looks loose and the other tight, you are pulling too hard on one yarn or not pulling hard enough on the other.

The unused yarn should sit loosely inside the fabric, not pulled tight. If you pull it too hard, the fabric will pucker. If you leave it too loose, it will create loops on the inside. Practice on a small swatch first to find the right feel.

Reading your stitches and fixing mistakes

Double knitting looks confusing at first because you see two layers. To read your stitches, look at the front layer only. Each stitch on the front belongs to one color; the stitch directly behind it on the back layer belongs to the other color. If you need to count rows, count on the front side and assume the back has the same number.

If you drop a stitch, pick it up the same way you would in regular knitting, but be aware that you are picking up only one layer. The stitch behind it is separate and will not be affected. If you need to rip back, pull the yarn and unravel to the row where the mistake happened, then pick up stitches on both layers carefully.

Twisted stitches are common in double knitting because of the hand movements involved. If a stitch looks crossed, it usually means you worked into the back of the loop instead of the front. This is straightforward to fix on the next row by working through the front loop as usual.

Binding off double knit fabric

Bind off using both colors together to keep the edge balanced. Work two stitches with color A, pass the first over the second. Work one stitch with color B, pass the previous stitch over it. Continue alternating colors and binding off as you normally would. This creates an edge that matches the rest of the fabric and does not curl.

Some knitters prefer a two-color bind-off that is more structured. Work two stitches with color A, bind off one. Work two stitches with color B, bind off one. This method takes longer but creates a very neat, even edge that looks intentional on both sides.

After binding off, weave in your ends on the inside of the fabric where they will not show. Because double knitting is reversible, you have two "insides" to choose from, so pick whichever is less visible.

Common mistakes and how to avoid them

The most common mistake is pulling the unused yarn too tight, which creates puckers and distorts the fabric. Remember that the unused yarn is just sitting inside; it does not need to be pulled. Let it rest naturally between stitches.

Another frequent error is accidentally knitting or purling a stitch that should have been slipped. This breaks the color pattern and creates a stitch that belongs to the wrong layer. Check your pattern row by row and mark which stitches belong to which color if you are new to the technique.

Uneven tension between the two colors is also common. If one side of your fabric looks looser than the other, you are likely pulling harder on one yarn. Try holding both yarns with equal tension in your hands and adjusting your grip until both sides look even.

Tangled yarns happen when the two balls get twisted around each other. Keep them in separate containers or use yarn bowls to prevent this. If they do tangle, stop and untangle before continuing; it is faster than ripping back later.

Frequently Asked Questions

Do I have to use a two-color cast-on, or can I use a regular one?

You can use a regular cast-on, but a two-color cast-on is easier because it automatically sets up both colors in the right order. If you use a regular cast-on with just one yarn, you will have to figure out which stitches belong to which color, and the edge may look unbalanced. The two-color cast-on takes a few extra minutes and saves confusion later.

Can I double knit with more than two colors?

Double knitting is designed for two colors, but you can work with more colors by treating pairs of them as your "two colors" and changing which pair you use on different sections. This is advanced and requires careful planning. For most projects, stick with two colors.

How much more yarn do I need for double knitting?

Double knitting uses roughly twice as much yarn as regular knitting because you are working with two strands throughout. If a single-layer scarf calls for 400 yards, plan for about 800 yards total (400 of each color) for a double-knit version. Check your pattern for specific yardage.

What if my two yarns are different weights?

Avoid mixing different weights. The heavier yarn will dominate and create an uneven fabric where one side looks thicker than the other. Use two yarns of the same weight and similar fiber content so they knit at the same tension and feel balanced.

Can I double knit in the round?

Yes, but it is more complex because you have to manage two colors on circular needles while keeping track of which stitches belong to which color. Most knitters start with flat double knitting (back and forth on straight needles) before attempting circular double knitting. Flat pieces like scarves and blankets are the best starting projects.