This is a great quality costume, not cheap like most and very comfortable. The Large/XLarge is really big. I normally wear a large in womens to fit perfect and this large was over sized and did not shrink. I went and returned it for a small/medium and that one fit perfect nit tight at all. I have a bigger belly area and my top half is a 40.  The womens small/med would fit someone that normall wears a medium. As the mens small/med would fit someone either inbetween a med and large or a large. The mens Large is really big and would fit somoeone with lonfer arms and someone that is a lil bigger and needs that extra room to feel comfortable.