Bought size 5 for my 4 year old son. He is tall and slim for his age and typically wears 4/5 pants that fit his waist and shirts that fit his torso. The waist in the pants was big but the belt did its job perfectly. The jacket was a bit big, but not that bad (it looks cute that it's a bit big, to be honest). The costume itself was way better than I expected for being so cheap for the price. It looks like a $235 men's suit I bought for my wedding. He was ready to carry the bag. If you need a perfect fit, I recommend going one size down from what your child usually wears. In general I am very satisfied with the purchase.
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