Sizing info from Designer:
This pattern is for plus size women, not skinny people. I wear a 3X or 4X depends on the clothing and who made it. The yarn stretches and the buttoms bring my well-endowed breasts in. I hope this helps with sizing. If you are a 1x/2x, I think you can use a J hook. If you are a 4x/5x or bigger than a 42D, try a L hook.