"The costume was very good. Size does run small. 7-8 medium fit a 3yr old around. It was a little long which could be hemed. I was disapointed in the mask. I thought it would be a hard one with velcro attachments. Instead it was cheap plastic with elastic string. The child had a hard time keeping it on his face and to be able to see. But he was delighted with the product as he is an ironman fan."