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How to join vertical seams (side seams or sleeves) using mattress stitch

• With the right side of the work facing up, lay down the pieces to be joined, flat and edge to edge. Working from the front and half a stitch in from the edge on each piece, insert the needle from the fron through the centre of the stitch sliding it under two rows as shown.

How to join vertical seams (side seams or sleeves) using mattress stitch step 01

• Cross to the opposite piece of work and slide the needle under two rows at a time. 

• Work from piece to piece in this way sliding the needle under 2 rows at a time, alternating from one to the other piece until the seam is complete.

How to join vertical seams (side seams or sleeves) using mattress stitch step 02

• Make sure that you don’t miss any rows and that the pieces match all the way up.

• If you are working a vertical seam in garter stitch or moss stitch take a full stitch from each piece, rather than half stitches.

How to join vertical seams (side seams or sleeves) using mattress stitch step 03