This bra is super cute. The elastic that goes under the breast is very tight compared to its size. I normally wear an extra small, but because of the reviews I got a medium, and the elastic was still uncomfortably tight. I’m also very flat chested, so it being a medium there was too much excess fabric under my armpits glaring out making room for larger breasts but it just looked dorky on me. I would try for a small but have a feeling that the elastic will be even tighter and more uncomfortable. Unfortunately I’ll be returning this bra. Hopefully running girl can try to update the product to have more stretch under the breast as I see this is a common concern amongst buyers.