From Kanye bossing the Brits with his army of black-clad backup dancers (jk, Stormzy) to Justin Bieber trolling rock purists with his throwback Nirvana swag, it's a been a strong, strong year for pop visuals. This aesthetic feast has extended to the world of the music promo, with some of 2015's best tunes coming armed with ace vids featuring even more ace outfits. Here are our favourite seven…