Kitty and Vibe is a small business creating swimwear and pajamas that fit great, look great, and fuel self-love. Bonus — they are committed to ethical labor and sustainable packaging/materials for a better, cleaner world. 

Promising review: “This is the best bikini top I’ve ever owned. I am a 42DD, and this top gives me a boob job! I’m not kidding. It’s super comfortable, and the girls look impeccable! Love…love. and let me say it again! LOVE! Highly recommend.” —Indigo80s

Get it from Kitty and Vibe for $68 (available in sizes XS–4X, four smaller band sizes, and three styles). 

Source: https://www.buzzfeed.com/daniellehealy/swimsuits-for-large-busts