My daughter is 2.5 years old and wears 2t, bordering on 3t but never 4t. I bought the 4t based on the reviews - the top is mostly snug in the hands (she fidgeted when putting it on) and the bottom is a little large in the butt length area. She still loves it and I love that it's washable, the colors are bright and washes well, but I wasn't impressed with the custom sizing. For comparison my 4.5 year old son got the Spiderman suit/pyjamas and they fit perfectly. He also has an old Thor pajama/suit that also fits proportionately. That's why I'm the superhero pajamas expert!
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