Woe betide the woman who plans to wear a bra this spring. Topshop Unique wasn't the first show this season to assert that the back is the erogenous zone du jour, but the theme was drilled home with particular emphasis here. The Topshop runway featured acres of naked back, with particular repetition of nineties-ish spaghetti-strap sundresses that dove low, low, low down the spine. Elsewhere, the nineties theme played out in a few other ways, such as the big low-slung jeans with a raw look and a gigantic cuff, and the prevalent suede and gaudy print, both of which evoked the seventies as they were reinterpreted two decades later. Fashion is a hall of mirrors, indeed. Beyond that, it was difficult to detect coherence in this collection: some mirror embellishment, a little raw-edged take on the classic Chanel bouclé suit with slouchy shorts, a soupçon of the crafty, courtesy of batik prints and hand-knits. That's an incomplete summary of the ideas thrown into the mix, but you get the gist. Eclectic may have been the point, but it didn't add up to a strong statement. In the end, what stuck with you was the image of Jourdan Dunn in a long blue bias-cut slipdress as she walked away, revealing the world's most perfectly engineered, enviably braless back. It's going to be a long summer, girls with tits.