We have had the hardest time finding underwear for my 7 year old daughter that is cotton and FITS. She wears a size 6/7 in all other clothing but we ordered the size 8 of these due to how many other set of underwear we have bought that were size 6/7 and were too small. These work just fine, don't shrink in the dryer, and haven't fallen apart yet. She also says they aren't itchy, so that's a plus!