How to Crochet a Gradient Pullover Sweater with a Dense 4mm Stitch

Materials & tools you'll need

Step 1 — Plan your measurements and colour blocks

The gradient runs from dark brown through a lighter tan-brown and a soft sage to a dark green, and the plan starts with a quick sketch of a basic body and a basic sleeve. Here the sweater is sized for a petite wearer, so the sleeves are 21 inches long and 18 inches wide. Folded in half, the top of the sleeve is 9 inches, which means the armhole gap on the body also needs to be 9 inches so the seam blends in. On the body, leaving about 10 stitches unworked at each armhole edge creates that gap.

Weigh your yarn and divide each colour into four centre-pull cakes: one each for the front, the back and the two sleeves. The dark brown and the dark green take up most of the sweater, while the sage and light brown are transition shades, so they get fewer rows. The body plan is 16 rows of forest brown, 10 rows of light brown, 6 rows of sage and 14 rows of fir green. Keeping each block to an even number of rows means every colour change happens on the same side of the work. Plans can shift as you go, so treat the row counts as a starting point.

This sweater is also a hook-size experiment. A 4mm hook with tight tension makes a much denser fabric with less drape than the same pattern in a 5mm or 6.5mm hook, so if you prefer a looser fabric, size up.

Step 2 — Chain, then work the ribbed hem

With the forest brown and the 4mm hook, chain 71. At this tension that gives roughly 20.5 inches of width: 69 stitches for the body, plus the turning chain. Work a double crochet into the fourth chain from the hook and double crochet across. Chain 2, turn, and work the ribbing in front post double crochet and back post double crochet, for about 5 rows or roughly 2 inches in total.

Keep your tension snug on the ribbing so it holds together densely. You'll know it's time to change colours when you come back to the same side as your starting tail. If you'd like a slower walk-through of the stitch, see the front post and back post double crochet ribbed stitch tutorial.

Step 3 — Work the body in half double crochet

Chain 1 and turn. For the first row, work half double crochets into the big gaps between the posts of the ribbing. From there on, work half double crochets with the hook inserted under the entire stitch rather than only through the top loops. It isn't the traditional placement, but it locks each stitch in place and gives a dense, structured fabric. Chain 1 and turn at the end of every row.

Work 16 rows in forest brown, which adds about 5 inches above the ribbing, then 10 rows in light brown, 6 rows in sage and 14 rows in fir green, changing colours on the same side each time. By the end of the fir green the piece is about 16 inches tall and 21 inches across. Keep your tension tight throughout, since the stitches will loosen up a little once the piece is blocked.

Step 4 — Shape the armholes

After the last fir green row, turn without chaining. Slip stitch into the first 11 stitches, chain 2, and half double crochet across until 10 stitches remain. Leave those last 10 unworked, chain 1 and turn. The chain 2 comes out of the 11th stitch, so only 10 stitches are actually skipped on that first side.

Continue in half double crochet on the narrower section above. The plan was 20 rows, but the front needed 22 rows, because the finished section, including shoulder shaping, has to be about 9 inches tall so the sleeve fits into it. If the gap is too small, the sleeve won't fit, so measure as you go and add rows as needed. This style (a rectangle with a smaller rectangle above it) is easy to modify: add or subtract stitches, and keep both sides symmetrical.

Step 5 — Shape the front neckline and shoulders

Half double crochet across the first 16 stitches for the shoulder, chain 1 and turn. Skip the first stitch and half double crochet back across (15 stitches). From here, keep the outer edge straight and shorten the neck edge by one stitch each row by not working into the last stitch: 16, 15, 14, 13, then 12. Work one more row of 12 stitches straight across, so the shaping takes six rows in total. The neckline is judged by eye, so there is no exact formula. All that matters is that the shoulders end at the same stitch count as the back, and that the shoulder section measures about 9 inches.

For a closer-fitting neck, bring the neck edge in by 16 or 17 stitches on each side. For a V-neck, bring it all the way to the centre. Then work the other shoulder the same way: count 16 stitches in from the centre, attach the yarn and repeat. Check that the front and back shoulders have the same number of rows. If one side comes up a row short, undo the shoulder shaping and fix it. The front of this sweater is also where the hand-embroidered iris goes: a bulb at the bottom, roots branching into the brown section, leaves in the green area and blossoms above.

Step 6 — Make the back and shape the shoulders

The back is worked exactly like the front through the armholes. The difference is that it's longer, because it has to curve over the back of the shoulders: the smaller upper section is 30 rows on the back instead of the front's 22.

The back neckline stays shallow, with no deep curve. Shape each shoulder by working 16 stitches, then curving the outer edge down with 3 slip stitches at the start of the next row, which brings the shoulder to 12 stitches. Mirror this on the other side. Then work straight rows of 12 half double crochets until the shoulder section measures 9 inches. It took four rows in the video, and if you're short, add a couple more. Fasten off, leaving the back plain.

Step 7 — Crochet the tapered sleeves (make two)

With forest brown and the 4mm hook, chain 35. The rule for sleeves is the same as the body: use an odd number. If 35 doesn't fit comfortably around the wrist, go down to 33 or 31, or up to 37 or 39. Work a double crochet into the fourth chain from the hook and double crochet across. Close the last stitch with the yarn tail worked in, which strengthens the side edge and brings the tail up to be woven in later.

Work the cuff in front post and back post double crochet ribbing (5 rows in total, counting the double crochet row), finishing on the same side as your yarn tail. You can make the cuff as narrow or as wide as you like. Then switch to half double crochet, with the first row as an increase row: two half double crochets in the first and last stitch, inserting the hook under the whole stitch.

Increase every third row: one increase row, then two regular rows, and repeat. This tapers the sleeve more gradually than the usual every-other-row increase, giving a more fitted sleeve with less bagginess. Use the same colour order as the body, but with a longer fir green section: 16 rows forest brown, 10 light brown, 6 sage, then about 30 rows fir green, for roughly 62 rows and 21 inches in length. Make 14 increases in total and stop increasing when the sleeve reaches 18 inches across, then work straight to the end. If your sleeve needs to be longer or shorter, add or remove rows of fir green.

Step 8 — Block the pieces, then assemble the sweater

Soak the pieces for about half an hour in a tub of tepid water with a capful of wool wash. Then spread them out and pin them onto blocking mats with T-pins and leave them overnight. Check which side is the right side on each piece and match the fronts. With the 4mm hook, slip stitch the shoulder seams together through the top of each stitch (both the front and back should have 12 stitches). A slip stitch is less visible than a single crochet.

To set in each sleeve, turn the garment so the wrong side faces you and fold the sleeve in half to find its middle stitch. Tie that point to the shoulder seam, then line the sleeve up around the armhole. The sleeves here are hand-sewn in with a blanket stitch, using a double strand of fir green yarn to match the thickness of the fabric, and the ends are woven in rather than knotted, because the wool will felt together after washing.

Next, turn the sweater inside out and close the sleeve and side seams with slip stitches, starting at the bottom. Switch yarn to match the stripe at each point so the seam disappears on the outside. Because the fabric is half double crochet worked with a small hook, you only need one slip stitch per row. Finally, slip stitch around the bottom edge and both cuffs, working into the gaps of the ribbing. This tightens the ribbing a little and keeps it from stretching out.

Step 9 — Add the collar and finish

Start one stitch after a shoulder seam, so that you can weave your end in without it showing. Chain 1 and work one round of half double crochet. This smooths out the stair-step edges left by the neckline shaping. Aim for an odd number of stitches so the ribbing alternates front post and back post correctly. If you end up with an even number, add a stitch or crochet two together in the next round.

Chain 2 and work a round of double crochet in every stitch, then three rounds of front post and back post double crochet. This creates a neck that sits high enough to hide under a T-shirt without being a turtleneck. Finish with a round of slip stitches. Keep your tension tight, as you did on the body: the collar will relax when you block the finished sweater, just as the body did. Weave in any remaining ends, then give the whole sweater a final wash and block. It will take a day to dry, but it comes out roomy, a bit long and very cosy.

Frequently asked questions

What materials do I need to crochet a gradient pullover sweater?
You will need wool yarn in four shades (forest brown, light brown, sage green and fir green), a 4mm crochet hook, a tapestry needle, and a kitchen scale for dividing your yarn into even portions. For finishing you will also need wool wash, blocking mats and T-pins.

What does working half double crochet through the entire stitch do?
Instead of working into the top loops only, you insert the hook under the whole stitch. This locks each stitch in place and gives a dense fabric with very little drape, which makes a boxier, more structured sweater. Combined with a 4mm hook and tight tension, the stitches stay clearly separated and have a chainmail-like look. Hook size changes the result a lot, so a 6.5mm, a 5mm and a 4mm sweater worked in similar patterns turn out quite different.

How do I adjust this crochet sweater to a different size?
Add or remove stitches in pairs, as long as the garment stays symmetrical. Start with an odd number of foundation chains so the ribbing works out evenly. The key measurement to match is the armhole: the gap left on the body needs to equal half the width of the sleeve at its widest. Here the sleeve is 18 inches wide, which folds to 9 inches, so the armhole gap is 9 inches. If your gap is 10 or 11 inches, adjust the sleeve stitches to fit. For a smaller or larger wrist, change the sleeve chain by 2 stitches at a time (31, 33, 35, 37 or 39).

Why increase the sleeves every third row instead of every other row?
Increasing every third row gives a gradual taper and a more fitted sleeve with less bagginess. You can increase every row, every second, third or fourth row, or however you like. Just make sure the sleeve reaches its full width (18 inches here) in time to fit the armhole, and then work straight up. More frequent increases mean a longer straight section at the top.

Should I slip stitch or sew the sweater seams together?
Either works as long as the seam holds. Slip stitching with a 4mm hook gives a tidy, clean-looking seam with less stretch, and because each half double crochet row takes only one slip stitch it is easy to keep even. Sewing is a little softer. Here the sleeves are set in with a blanket stitch for a bit of give around the body, and the side and sleeve seams are slip stitched in the colour of each stripe so the seam doesn't show.

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