Purchased at a GU store. It's a size S, but it runs a bit large, so I think it would fit someone who usually wears a size M. It's new and unused, but I bought it in a hurry because I needed it urgently, without checking it properly. I overlooked a stain on the right collar, possibly from eyeshadow or something similar. In my opinion, it's faint, so you probably wouldn't notice it unless you looked closely. It might come out if you wash it. I'm selling it because I no longer need it.