The Rails Costa Denim Shirt Dress features a chic, sleeveless design with a belted waist and a midi length. The Rails Costa Denim Shirt Dress features a chic, sleeveless design with a belted waist and a midi length. Rails has been on a mission to redefine wardrobe staples, raising the bar for comfort and style in the industry. What began with a single plaid buttondown that felt softer than anything on the market, has evolved into a full range of lifestyle staples. With fabric innovation and the tactile experience at the heart of each collection, Rails continues to elevate essentials with timeless silhouettes and unmatched hand-feel — creating a brand that captures the essence of West Coast style from a global perspective.