"I agree with other comments that the costume runs very small. People are saying "petite" but that's not entirely the case, as the length of the costume is about right if not slightly long. It runs extremely slim. My daughter just turned 5, can still fit some of her 4T clothes, so I ordered the 4/6. I'm concerned that I won't be able to put on warm enough clothes underneath for trick-or-treating b/c the size doesn't allow for ANY give. The waist is very snug, to the point where even though she has not hips yet, it was hard to get it over them. The seams are all very precarious too, which doesn't help since you feel you must pull and tug to get it on. There's no way ordering her an 8/10 would've been better b/c it would've been WAY to long."