sleeves are long and form fitting but not super tight. the main reason i bought a medium instead of a small is because i am super busty (34D on a 5''2" frame, about 112 pounds) and i needed to make sure the bra top could fit my boobs. it does with just enough support. i don''t feel like i''m strangling myself putting it on, and i know i will be comfortable and comfortably covered when i''m around my students at the beach in a few weeks.i''m v. happy with the purchase.