Uploaded January 2021 | Updated September 2026, 6 minutes ago

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Learn how to sew side and sleeve seams in one, on a pieced sweater, with mattress stitch.

This technique is used on the Unite Sweater and Reunite Cardigan, both from Something to Knit Together Winter Edition. The collection includes five cable patterns designed by Natalie Warner and supported by tutorials from A-C Knitwear. The eBook is available to purchase on Ravelry ravelry.com/patterns/sources/something-to-knit-together-winter-edition

Our books can be purchased from our retailers: actechniques.co.uk/retailers

Other tutorials in this series:
Setting in a Sleevehead with Mattress Stitch: youtu.be/FJXYnnIdSTM
Joining Shoulder Seams with Back Stitch: youtu.be/llhhIH_gk_E

0:00 Introduction
0:49 Pinning the sleeve and side seam
2:07 Preparing to sew and a note on joining yarn
2:48 Avoiding uneven cuffs
3:26 Setting up mattress stitch
4:11 Working mattress stitch on reverse stocking stitch
5:40 Working mattress stitch on stocking stitch
7:09 Working mattress stitch on the garter ridge
7:27 A note on tightening
9:14 If you find your fabric isn't matching up
9:55 Mattress stitch at the underarm
10:58 Mattress stitching the side seams
12:12 The last section
13:58 Finishing off