I have to say I was surprised by the durability of this costume. I was expecting a much cheaper version. The material has a faux leather feel to it and  looks great. It looks great on my two year old and it fits her great. I would say that if your child is a 4T then this costume may be too small for her. I just can't see it fitting a 4T child. It fits my 2T wearing daughter great and I feel it would look fine for a 3T as well. The mask is surprisingly more durable than I thought it would be and it fits her well. It has a tendency to slip down but that is also due to my child playing with it often. All in all it's a great costume and my daughter loves it.