A simple rectangle folded in half
Machine knit using a lace stitch (15” wide or 72 sts x length measured from wrist to wrist, see #2 at this link), green kp’2, and a crochet edge.

Lace stitch is from this pattern; use the Magic Needle Selector Wand (8mm) for selecting needles & a yard stick to move all 72 stitches into working position. Tools to open latches: single-prong transfer tool & v-cut credit card.

Crochet edge is from this book by Interweave Press.