Hi! I’ve got a medium macom and I’m a 34 band, I tried it on the other day (pre op) and it was quite loose but I think it’s because my boobs are so small! It didn’t fall down or anything it just felt like it could’ve been tighter, but obviously post op I’ll have bigger boobs and more swelling so I think it will fit perfect then! I think the large would be massive on me. Im a size 6 clothing and a 34aa. Hope this helps!