This would probably be a Women’s Small, or Extra Small (it is roomy, so could be a medium) You can adjust the size as the pattern is very forgiving. To increase the size, add stitches to your initial chain. Increase in sets of 3’s.

Meaning, my pattern says 52, so you can up it to 55, 58, or 61, for example. The best way would be to make your chain the length of shoulder tip to shoulder tip. You can then follow my pattern, with your new stitch count. It is a VERY easy pattern consisting of two squares seamed together. The pattern does create a neckline detail, but if you want to make this REALLY easy, just chain and do strictly broomstick lace throughout the two squares. Seam, and that’s it!