PRINTS POP AT MCQ: Alexander McQueen’s McQ diffusion line planted a pop-up showroom in London’s Soho Thursday to launch the label’s spring collection. The spring line — which is filled with slouchy silk tiger print T-shirt dresses, pink and black gingham shirts and optical print leggings in clashing colors — was displayed in a street-level store, allowing curious passersby to wander in alongside press to preview the collection. The company has previously shown the McQ line at fashion weeks in New York and Milan since it launched in 2006, but opted to unveil it during a showroom setting this season. In addition to a host of printed pieces — such as a white silk bubble-hem skirt printed with black and pink feathers — the line also spotlights sharply tailored black jackets, ultraskinny jeans and harem pants. There are accessories too, such as leather hold-alls and feather print silk scarves. Prices for the line range from 80 pounds, or $126, for a T-shirt through to about 420 pounds, or $663, for a leather jacket.