Worsted weight yarn made hexes big enough to go quite around my arms and far down my sides. So I only had to add a few rows on the body.
Single crochet ribbing around the back and then from the bottom on the right all the way around the neck and down the left.
Ribbing on body: chain 11 for nine stitches. Ribbing on the sleeves: chain 20 for 18 stitches.
Tapering : After the hexes are sewn together, sleeves need tapering every 2 rows. Single crochet around bottom edge of the sleeve, then do ribbing into row of single crochet.