From McCall's:
Dresses and jumpsuits have close-fitting lined bodices with neckline and flounce variations and invisible back zipper. A, C: Purchased elastic in bodice upper back. For moderate stretch knits only.
Recommended Fabrics: Moderate stretch knits, (35% Cross Grain). Sequin Knit, Velvet Knit, Interlock, Jerseys. Lining: Tricot.Sizes: (6-8-10-12-14), (14-16-18-20-22)