Very cute well-made costume. It's lined and looks quite warm. It does run small, though. My step-son is in a 3T, but I figured that with clothes underneath I'd rather it be a little big so I ordered the 4T. When he puts it on it barely zips up. I was hoping that he'd be able to get some use out of it, but now I'm just hoping that he doesn't gain any weight before Halloween!