Lot of 4 Girls’ Swimsuits Size 4t

All 3 one pieces have some yellow discoloration on the inside of the suits (on the lining) that was not there before putting them into storage. I washed them again, but wasn't able to get out the discoloration. Pink bathing suit is labeled as "L" but I believe this is Chinese sizing, not American. When held up to the other suits it is the same size. The suit is a 2 piece with a swim bonnet. Suit with Mickey Mouse silhouettes is XS but same size as others when compared.