"runs horribly small! My son is 4, and a very small 4 wearing a 3T in shirts and a 24 mo. in pants/shorts. We ordered the 4/6 to be on the safe side.. and it is so short on him in the stride. The arms and legs fit well, but it is kinda going up his behind and very uncomfortable to sit in. He loves it so much and wants to be something "scary " for halloween and this was his first year picking his costume and his heart is set on this. We are also having a horrible time getting the gloves on, some of the fingers were still glued together and we cant get them to fit his hand right so we might have to find a different pair. the material is really thin and the hood it attached odd to where it is very hard to get it on without ripping. The hood should, in my opinion, be attached to the mask, but its attached to the back side of the costume which means you have to fit the child's entire body thru the hood/face opening to get the costume on.. i was scared to death it was going to rip before he could even wear it. Overall, the costume is super cute for a small child wanting to be "scary". We will keep it only because he loves it so much but they need to offer this in a bigger size if they truely expect young children to wear it..."