I went on a hunch to choose a size for my son. He is a tall, slim 7 year old. And based on his measurements I would have had to mix and match the suit. But I didn’t have time for this and went for the size 7 and it was fine. The waist of the pants was too big but there are these elastic adjustable bands there and it was perfect.
Calvin Klein Kids' 2-Piece Formal Suit Set
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