A knitted hem 1948quilter This was a top down sweater, so it was super easy. Knit until the sweater is long enough, then do a purl round. Switch back to stockinette, then decrease by 10% evenly around. Knit a bit, then sew each stitch down to the purl bump at the back of the work, rather than binding off. It's an Elizabeth Zimmermann thing and can be found in some of her books.