J Crew Mint Horizontal Striped Box Top

Medium, but depending on how loose you want it, it could fit anywhere from an XS-L really. My model is an XS-S depending on the shirt and I think it fits her great, but I am a L-XL and it fits me as well. Like new, some pinpoint holes on the last white row at the bottom of the shirt, unnoticeable really, just felt I should mention! The 3rd photo depicts the color best.