"The material is a bit thin but that's nothing a short sleeved sweater can't fix. Glad I read the other reviews because this does run very small! My daughter is a small 2-year-old and the 3/4T fits her with a bit of room so this would not fit a an average sized 3 year old! Recommend stuffing the hat to help it keep it's shape. A very cute costume! My daughter didn't want to take it off after trying it on!"