Hi all, there's an error in the pattern for XS. Here's Saun's response:
I apologize for the error. You should cast on 86sts for the XS but the line should read (correction in red):
Next RS row: k10[12,12,12,12,12,12], p2tog, yo, k3[3,3,3,5,5,7] , work chart 1, k2[2,4,6,8,10,12], work chart 2, k2[2,4,6,8,10,12], work chart 1, k3[3,3,3,5,5,7] , yo, p2tog, k10[12,12,12,12,12,12]. On next and all WS rows, work stitches as they lay, purling yarn-overs. (This means that if the stitch was knit on the RS, then you will purl on WS. If purl on RS, then knit on WS.)
Please let me know if you have any other problems or questions.