Super stretchy material that fits a range of body types. No size that I can see but fits loose / baggy / oversized on S/M but would also fit L due to the stretchy material. I've added pics with the pit to pit measurements. Great for running errands or jazzing up your yoga outfit. Also goes great with a pair of jeans! In great condition, bought in Japan and only worn 2 times. Note the color is somewhere between white & off-white.