Christopher Esber's one-piece swimsuit is defined by a pronged U-neck and sleek open back. Plunging pronged U-neck Sleeveless Open back Pull-on style Lining: 72% polyamide/28% elastane 72% polyamide/28% elastane Hand wash Imported SIZE & FIT Model measurements: 5'10" tall Model is wearing a US size 4. Designer Rtw - Designer Atrium Collect > Christopher Esber > Saks Fifth Avenue > Barneys. Christopher Esber. Color: Black. Size: 2.