How To Make a Right-Leaning Modular Strip
Beginning on a RS row, knit into the front and back of the first stitch.
You’ve increased one stitch.
Knit across the row until there are 3 stitches remaining.
Knit the next 2 stitches together.
Yarn forward between the knitting needles so it’s at the front. Slip the next stitch as if to purl.
Insert the right hand needle through the selvage stitch of the adjoining strip from back to front, wrap the yarn around the needle purlwise and pull the stitch out through the back of the selvage. This is basically a “pick up and purl” maneuver (similar to pick up and knit).
Pass the slipped stitch over the last stitch on the needle. The RS row is complete.
Turn the work over so the WS row is facing.
Slip the first stitch as if to knit.
Knit across the row until there’s one stitch left.
Yarn forward. Slip the last stitch purlwise.
Rep those two rows make up the right-leaning modular strip.
Jamie uses the same joining technique except there’s no shaping at the beginning and end of the RS rows. The whole sweater is assembled modularly. There is no sewing in Jamie except for weaving in a few ends.