I received these as hand-me-downs, but they were never used and my child outgrew them. MUJI is size 100. Uniqlo is size S, but the size is about the same as MUJI. I think they are 7/10 length. The part with the name written on it will be blacked out. How about these for a change of clothes? Immediate purchase only, no questions asked. No claims and no returns, please. These are used items, so please consider this before purchasing.