I can't tell the brand or material because there's no tag!! The color is khaki. I think it can be worn by both M and L sizes!! I don't see any stains or spots, but please understand that there's a possibility I missed something. The sleeves are designed to flare out towards the wrists. It's very cute, and I think you can wear it sexily without being too flashy around the chest!! The back is designed to be a little longer!! It's loose-fitting overall, but I think you can wear it stylishly without looking frumpy!!