Lot! Two brand new bathing suit. Size 20/1x but FIT MORE LIKE A 16

Two brand new bathing suits. 1 from boohoo (has tags and crotch lining) size 20 but fit like a 16. the other from shein (has crotch lining) size 1x and again fits more like a size 16. tried on but never worn. one is leapord print the other is neon orange. gorgeous bathing suits and flattering.