One of the most popular styles for an open back wedding dress is most often the trumpet or mermaid shape. This sexy and feminine dress shape goes well with a back cut-out. A fitted design with a straight shape will call to mind a vintage 1920s vibe, especially when composed with a lace overlay. A daring option is a nude illusion bridal dress. This can include a nude layer with a back cut-out and sheer ivory overlay. Striking, sexy and definitely daring, this is a modern and trendy look for the bride who wants to show off her figure.