this is a great top. if you fall into xs or s get s. likewise if youre size is sometimes s or m, buy m. im a 5 1 in height, 52 to 53 kilos and i could wear xs or s and sometimes medium and i bought this blouse in S, and it length just touches the boundary of the most highwaisted pants i could wear. a little bend, movement or raising of the arms my skin is exposed hehe. but manageable and i love this blouse. another is the level of being transparent..no, its a big no problem for me. i am morena in complexion and i just wear nude or skintone bra and its not even obvious. no need to wear tank or cami to hide your boobies.