This is a zig zag mesh pattern using front and back post stitches. The pattern is for a tight fitting tank top, but the crochet is very stretchy, so it is not too tight. The pattern includes instructions for shaping.

Chest sizes cm(in)
Small - 90 (35.5)
Medium - 96 (38)
Large - 102 (40)
XL - 108 (42.5)
XXl - 114 (45)

The pattern uses DK acrylic and requires 3 x 100g for Sml - Lrg, and 4x 100g for XL and XXL