From the Vogue website:
Dress has fitted bodice with waist and front shoulder pleats, V-neckline and back zipper. A: Sleeveless. B: Ruched criss-cross bands across front waist. B, C: Long sleeves. Necklines, bands B, sleeves B, C: Narrow hem.
V8921 | Misses' Pleated V-Neck Dresses