Calvin KleinGirls' Modern Cotton Hipster Underwear

Bought for the comfortable tape waistbands and as nice underwear for our pre-teen as she starts secondary school, but although she’s only 11, the L size is quite snug on her and she’s in normal uk sized clothes for her age. The XL would probably be better but that’s kind of ridiculous; what would a 14yr old wear, XXXL?!