- 82% Regenerated Polyamide, 18% Elastane - Fits B-C Cup - Moulded And Underwire Support - Adjustable Back Hook Closure - Adjustable Straps - Crystal Embellishments The Sweet Sacre Bleu Sweetheart Neck Underwire Moulded Bikini Top features a flattering decollete, with moulded support and adjustable straps for a flawless fit. Inspired by the ornate interiors of Le Train Bleu, in the print a deep blue landscape is overlaid by gilded Belle Epoque detailing.