Known for their expertly designed knits, St. John effortlessly captures the closet essential little black dress. This dress features a simple fitted silhouette and a center slit at the back. Roundneck Sleeveless Concealed back zip closure Back slit Rayon/wool Dry clean Imported SIZE & FIT About 40" from shoulder to hem Model shown is 5'10" (177cm) wearing US size 4. Women Rtw Swim Outerwear - W Designer Sportswear > Saks Off 5th > Barneys Warehouse. St. John. Color: Black. Size: 8.