- 95% Cotton, 5% Elastane - Round Neckline - Midi Length - Slim Fit - Shaped Waistline - Cap Sleeve - Unlined - Crystal Embellishment Our Sweet Sacre Bleu Jersey Cap Sleeve Midi Dress is a sinuous column with a softly sculptural shape, designed to flatter and elongate. The sleeve detail elevates with flattering styling. Inspired by the ornate interiors of Le Train Bleu, in the print a deep blue landscape is overlaid by gilded Belle Epoque detailing.