WHEN it comes to stocking up on new season essentials, a coat is one of – if not the most important item you’ll buy. It’s got to look good, keep you warm, and mesh well with the rest of your wardrobe, so this isn’t a purchase that should be taken lightly. That’s why we’ve assembled a guide to the catwalk-inspired coats and jackets that will help you look cool and stay warm this winter. Whether you want an affordable wardrobe update or an investment piece, here are the trends you need to know about and where to shop them… This season’s coolest check coats are longline and straight cut, perfect for layering over swishy skirts or wide leg trousers. :: Principles Multicoloured Checked City Coat, currently reduced to £52 from £65; Principles Black Check Print Wide Leg Trousers, reduced to £28 from £35; Principles Navy Check Downbrim Hat, £22; Faith Natural Leather Trim Kicks Chunky Trainers, reduced to £23.20 from £29 (jumper, stylist’s own), Debenhams :: Palones Kimmi Deconstructed Trench, £185; Batwing Shirt, £59; Kimmi Deconstructed Wide Leg Trousers, £130 (shoes, stylist’s own) Whether it’s a short and sweet jacket or a...