Aerie Blakely Underwire Halter Swim Top Shell Pattern Lace Sky Blue Size 34C. Underwire bra style swim top with cute shell-patterned lace, padded cups, and halter and back ties. Perfect if you want extra support. Size 34 C. Equivalent to size M (see Aerie size chart in photos). Deep sky blue. Excellent condition, only worn once and washed. 95% nylon, 5% elastane. Tags: swim top, bikini top, swimwear, lace, shells, halter, push up, beach, swim.