At first I wasn't sure what size to buy for my 3 year old. She is tall and thin and is currently wearing a size 4T, but sometimes the pants and sleeves are too short depending on the brand. It's cold here on Halloween, so I wanted to have enough room downstairs for sweaters and pants as well. I ended up buying a Large/4-6. It worked out great because I don't think I could fit warmer clothes on a smaller size. The legs and arms were too long so I had to roll them up and the mask tended to dangle over my eyes so I had to fix that with a bit of tape as well. If she was wearing tight clothes or just panties underneath, it would be quite baggy on her. Hope that helps.
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