Stella McCartney is rapidly building a reputation as the go-to designer for athletic clothing inside — and outside — the sports arena. Earlier this week, she unveiled some fresh looks for Adidas, and introduced her first of three Team GB lifestyle collections, which will be launched in the run-up to the 2012 London Olympics. At Adidas by Stella McCartney, she added a “weekender” element to the collection, complete with sleeping bags, a cape that doubles as a picnic blanket, and rubber ankle boots. Her first Team GB lifestyle collection is for the British public rather than the athletes — whom she’ll be dressing in 2012 — and it features hooded sweatshirts and T-shirts with the Union Jack logo for men, and cropped Windbreakers and a metallic gold cape for women. “It’s a different demographic for me — a lifestyle collection for the nation,” she told WWD. “And it’s the first time I’ve designed sporty clothes for men.” She said a stand-alone men’s wear collection isn’t in the pipeline now, “but I would be interested in doing one in the future.”