I tried this on (blue) in size 0 or xs (not sure how sizing was), regular size (sometimes i need petite). i don't think i need petite in this one though, i love the peek of lighter solid fabric on the hem, the whole tank is very soft. probably need a strapless bra to wear it, but could be paired with jeans for casual look or nice pants. pencil skirt for dressier look. i am 115 lbs and 30 dd for reference.