Fashion Trenches 101 By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Updated on April 22, 2009 @ 12:13PM Pin Share Tweet Email Trending Videos Photo: Starmax Trenches 101 01 of 07 Buttons Ray Filmano/WENN The best are sewn on by hand and reinforced on the inside. Hilary Swank stayed warm in a satin Burberry Prorsum coat in bright turquoise; contrasting buttons added extra flair. GET HILARY'S LOOK ONLINE NOWRalph Lauren trench, $130; at ralphlauren.com. 02 of 07 Buckle Michael Buckner/Getty Don't bother with it. Simply knot the belt around your waist. Hayden Panettiere looked classic but youthful in a traditional Burberry trench cinched around her middle. GET HAYDEN'S LOOK ONLINE NOWJ. Crew trench, $298; at jcrew.com. 03 of 07 Lining Clark Samuels/Startraks The warmest removable linings will take your trench from spring through the start of winter. For a spring-only coat seek a light lining or a double facing. Or, choose a winter-friendly trench with cold-weather details such as leather trim—like the Operation coat worn by Alicia Keys. GET ALICIA'S LOOK ONLINE NOWThomas Burberry trench, $804; at my-wardrobe.com. 04 of 07 Belt Humberto Carreno/Startraks Updated versions of the trench may not sport all the details of the original, but the belt is a must-have. Renee Zellweger showed off her tiny waist in a belted patent trench. GET RENEE'S LOOK ONLINE NOWBanana Republic trench, $80; at bananarepublic.com. 05 of 07 Fabric Roger Wong/INF Goff Cotton gabardine is the classic. If you're looking for wrinkle resistance, avoid lightweight cottons; blends are often better. Kristen Bell kept her look crisp in a woven trench from Juicy Couture. GET KRISTEN'S LOOK ONLINE NOWMiss Sixty trench, $179; at bloomingdales.com. 06 of 07 Epaulets PacificCoast If you opt for them, make sure the coat fits precisely at the shoulders. Gwen Stefani made the scene in a trench with a flawless fit-and edgy frayed seams. GET GWEN'S LOOK ONLINE NOWRobert Rodriguez trench, $248; at shopbop.com. 07 of 07 Rear Pleat Starmax Make sure it closes easily. If it falls open the coat may be small. No one knows fit like Angelina Jolie, who was perfectly glamorous in a Loro Piana trenchcoat. GET ANGELINA'S LOOK ONLINE NOWGallery trench, $128; at nordstrom.com.