I’m in between sizes (M-L) I ordered a size Large considering Halloween costumes run a tad bit smaller than expected and I’m glad I did. It fit JUST RIGHT (a little snug, but that’s okay). I’m 6 ft - 160 lbs. if that helps at all. It has a red “slip” underneath which was a bit short. But that’s expected when you’re tall. Will have to wear some shorts underneath or a pair of stockings. Overall, I am very satisfied with the purchase! I would suggest sizing up one size if you wish to wear layers underneath. Happy Halloween!