Dress by Unique 21, For your daytime thing, Halter neck, Cut-out detail, Check design, Regular fit, Just select your usual size. Specialising in clean, minimal tailoring, British label Unique 21 smartens up your wardrobe staples with its latest offering. Designed exclusively in-house, the brand creates relaxed versions of traditionally formal separates. The result? A contemporary collection of tuxedo dresses, wide-leg jumpsuits and boyfriend blazers.