Definitely undersized. 2T/3T underwear will not fit your child when wearing 3T clothes. My son wore 3T but was slim so I ordered 2T/3T briefs. Definitely too small. So I had to order a size up. Now that he wears 4Ts, we don't wear 4Ts anymore. And by the looks of it, Hanes doesn't make a 5T in that underwear line, so it's not very helpful.
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