We bought the firefighter costumes for our sons for Christmas and they love them so much they never want to take them off. They are very realistic looking. I had to take my chances on the sizing, but based on other reviews I was able to guess right. The waist sizes that are shown on the website are very confusing ( and probably wrong). I ordered the small for my son who is about to be 3 years old ( and wears a size 3T) and the medium for my son who will be 5 in two months (he wears size 4-5). They are both average size kids and the costumes fit them with a little room to grow. The funny thing is, on the costume tags they have regular U.S. sizes which would have been helpful if known when ordering. The small is a size 4-6 and the medium is a size 8-10. Other than that, they are great. My sons wear them with their firefighter rain boots (purchased elsewhere).