Functions as a top or as a bra. Irie's standard sizing- which "fits best on small + med chested frames". 94% cotton and 6% spandex. Very stretchy and comfy. Perfect for breastfeeding. Very good condition. Worn less than 5 times. Hand-dyed w/ natural dyes, so it has some slight color variability. Measurements armpit to armpit: approx 12 and 3/4 (Take this measurement with a grain of salt since there is a lot of stretch that makes this multi-size)