Sportswear has become such a ubiquitous part of the modern wardrobe that it has ceased appearing as a trend. To wear your trainers with tailoring, or a tracksuit with a blazer, is no longer fashion-forward, but rather purely practical. This season, Louis Vuitton pushed the envelope even further, translating Nicolas Ghesquière’s love of era-defying anachronisms into petticoats worn with windbreakers, or historical garb spliced with futuristic bodices and parachute pants. “Taking what we already have at home and mixing it with what we like that’s new,” expressed the designer, “free of protocol or constraint.” To put it bluntly, he’s telling us we no longer need to stick to a single style in the morning. Collage haute nylons with ornate embellishment; layer your waterproofs atop pencil skirts; integrate pristine pinstripes with…