Our newest women's shirts - "Laxmi" and "Lexi" - are American Apparel 4305, which look curvy and great but run small - please order one size up. All the earlier designs - on the black shirts - are on Bella 1003 "baby rib" cotton, with scoop necks and a curvy fit; they run normal. (I wear a "medium" Bella 1003 and a "large" American Apparel 4305.)
We also have Women's Camisoles made by Anvil, for hot weather like what we have in New York during Summer. These fit tightly; they're supposed to (and look great); but for a relaxed fit order one size up.