For END. and adidas’ latest collaborative collection, named “Tennis Club”, the two look to the world of tennis and sport for inspiration. These shorts, for instance, are cut from blue towelling cotton — just like the accessories worn and used by players — and then embroidered with a tennis ball at the back pocket. There’s co-branding at one thigh, too — that iconic Trefoil and the British retailer’s name — to complete the look.