Robert Pattinson hasn't reinvented the wheel here, but what he has done is remind us that all it takes to look cool and relaxed when you travel is a simple yet carefully considered outfit. After all, there's no point in busting out all your swanky new holiday garms before you've even arrived at the hotel.
Like R-Patz, try to incorporate layers into your outfit, so that you can keep pace with the rise and fall in the plane's air-con by adding and peeling off as necessary. Try layering a classic checked shirt over a plain cotton tee, and keeping a bomber jacket handy for when the cabin goes Arctic mid-flight.
Lastly, it's worth remembering that there's no better way of announcing you're in full holiday mode than pulling on a pair of quality sunnies as soon as you've stepped off the plane.