I was really looking forward to this costume it’s a shame that I wasted $60 on it. I’m usually a small and sized down to a xs. I read the reviews and kept sizing down in mind as well as it running large in the chest area. I have a large bust (D cup) so I thought this would be perfect for me. WRONG. The chest area is meant for someone with an E CUP. if you’re a medium I suggest getting the xs and it might fit you. Size 2 sizes down. Otherwise save your money don’t bother with this costume.