Here at Who What Wear, we believe in building the best outfits to suit every occasion, so it's no wonder that we plan our travel attire just as carefully as we pack our bags! Fortunately, this season has provided us with an excellent array of essentials to work with, such as: textured outerwear, floppy hats, flat boots, utilitarian layers, and oversized, structured bags. Of course, when you have so many thrilling options at your fingertips, configuring these items into the perfect on-the-go look can seem like an overwhelming task. Thankfully, we have some excellent outfit guides in the form of eight stylish celebs who all know some amazing travel-attire tricks. And with the help of ladies like Lauren Conrad, Rachel Bilson, and Blake Lively--plus a handful of key pieces--assembling the perfect plane ensemble will be a cinch! So dust off your suitcase and grab your passport because by the end of today's What They Wear: Airports story, you'll have all the en-route outfit inspiration you could possibly need!

WHO: Rachel McAdams
WHAT: Arriving at Berlin's Tegel Airport early this month
WEAR: Christopher Raeburn parka, black and white printed leggings, leather boots, black floppy hat
WHY: A chic hat is a must when traveling, as it covers up unpolished hair and gives any outfit a little extra zing. If a wide-brimmed floppy version a la Rachel McAdams is your cup of tea, we suggest trying Deena & Ozzy's Felt Hat ($34), Eric Javits' Velour Brim Hat ($350), or Free People's Janis Brimmed Wool Tall Hat ($68). For the rest of your look, keep it comfortable and functional by styling any of those hats with Topshop's Khaki Coated Faux Fur Coat ($190), Ella Moss' Heritage Leggings ($60), and a pair of flat boots, like H by Hudson Murphy's Washed Tall Flat Boots ($293).

WHO: Charlize Theron
WHAT: Arriving at LAX late last year
WEAR: YSL Pre-Fall 10 bag, gray sweater, khaki trench coat, black pointy-toe heels
WHY: While we don't usually recommend wearing heels when traveling, if you're headed straight from the airport to a business meeting, Charlize Theron's ensemble is an ideal choice. We love the way she slicked her hair back in a neat bun and kept her look clean with a few basic pieces. To create a Theron-inspired look of your own, start with AG Adriano Goldschmied's Premiere Skinny Straight Jeans ($172), Topshop's Knitted Fine Gauge Long Sleeve Top ($70), and a pair of sleek heels, like Valentino's Black Patent Leather Pointed Pumps ($525). Just be sure to accessorize with an oversized bag, like Topshop's Light Tan Leather Contrast Buckle Strap Satchel ($170), as it is a must for holding all of your carry-on items.

WHO: Nicky Hilton
WHAT: Departing LAX late last month
WEAR: House of Ill Repute Hat, Ecote Surplus Jacket ($50), I Am Beyond Low Rise Yoga Pants ($77), Goyard Bags, Nike Shox Turbo Shoes ($100).
WHY: We understand that comfort is the number one priority when putting together your travel attire, but that doesn't mean a sweatsuit is your only option. By simply combining a few key casual pieces--like a lightweight jacket, yoga pants, and running shoes--Hilton was able to create a stylishly relaxed on-the-go outfit. To achieve a similar look for your next trip, simply pick up her exact pants, The Reformation's Tatum Jacket ($352), and her Nikes for an equally neat look.

WHO: Georgia Jagger
WHAT: Melbourne International Airport in November
WEAR: American Apparel Unisex Flex Fleece Zip Hoody ($46), Topshop leggings, Mood Fabrics scarf, Reebok Freestyle Hi Shoes ($65), top from Carnaby Street boutique in London, Chloe Tamaris Sunglasses ($295, 212.717.8220)
WHY: Functional layers are key when creating a prime jet-set outfit, as Jagger shows us. A basic hoodie and scarf are both essential pieces to have in your carry-on because you can simply add or remove them to match the climate changes without skipping a beat. When packing for your next getaway, don't forget to pick up Jagger's American Apparel jacket (it's a superb choice that will never go out of style) and Love Quotes' Eyelash Scarf ($86) in Loden--we promise they'll come in handy!

WHO: Rachel Bilson
WHAT:: Arriving at LAX early this month
WEAR: Juicy Couture puffer coat (it's from a few seasons ago), Paige Verdugo Jeggings ($199) in Lennox, UGG Australia Classic Tall Boots ($180)
WHY: An oversized puffer jacket is a great additional layer to have when traveling through chilly airports. While this type of coat may be too large to fit in your carry-on bag, you'll definitely want to throw something similar, like North Face's Menlo Puffer Coat ($249), on over a basic sweater or hoodie--you'll be happy to have it, trust us!

WHO: Lauren Conrad
WHAT: Arriving at JFK for a flight back to Los Angeles in October
WEAR: Urban Outfitters Cocoon Coat ($148), Chanel quilted bag, Sartor knee-high leather boots, black cloche hat
WHY: While Conrad's coat is perfect for keeping cozy on and off the plane, her sleek boots and prim cloche hat give the whole look a chic finish. For those of you looking to recreate Conrad's polished mix, start with ASOS' Chunk Waterfall Cardigan ($78) and team it with Forever 21's Cloche Hat ($14) and J. Crew's Weatherby Tall Boots ($325), and you'll be ready to hit the town upon arrival.

WHO: Emma Roberts
WHAT: Arriving at LAX from London back in August
WEAR: Isabel Marant white fur jacket and gray suede ankle boots, J Brand 901 Denim Leggings ($169) in Starless, Tom Ford sunglasses, Brown beanie, Chloe Elsie Crossbody Bag ($1095, 323.602.0000)
WHY: Throwing a chic, textured coat over a casual tee and jeans is a sure way to give your outfit a luxurious and warm finish. If you're in the market for something similar to Roberts' to-die-for jacket, Pins and Needles' Puff Sleeve Faux Fur Coat ($129) and Nasty Gal's Polar Fur Coat ($198) are both amazing options you'll want to check out. To further achieve Roberts' A+ plane ensemble, add Rag & Bone's Chunky Knit Beanie ($80), Forever 21's Be Nice or Leave Tee ($9), and Bagatt's Ankle Boots ($109) and you'll be good to go.

WHO: Blake Lively
WHAT:: Arriving at LAX back in October
WEAR: Autumn Cashmere Classic Rib Drape Tweed Coat ($264), Co-Op Barneys New York studded ankle boots, tan fedora
WHY: If you're planning on carrying loads of luggage or need to rush to your gate, a simple and unfussy outfit is key. Too many layers can often become overwhelming, so we recommend emulating Lively's lovely beige mix, starting with her fedora; Rag & Bone's Kingsley Wool Fedora ($160) is at the top of our list. Then you can pick up her exact knit sweater, Report's Adriana Boots ($40), and you'll be ready for the airport in no time.--Jessica Baker

Photos of Nicky Hilton, Rachel Bilson, and Blake Lively, courtesy of Bauer Griffin; Photos of Lauren Conrad and Charlize Theron, courtesy of Splash; Photos of Rachel McAdams and Emma Roberts, courtesy of Wenn; Photos of Georgia Jagger, courtesy of Getty