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A Pullover Sweater or Sweatshirt
Just like a belt, you should start removing bulky layers before you get to the X-ray machine. Stick to a zip-up style sweatshirt or cardigan so that you don't have to struggle to take it off (or mess up your hair in the process). In fall and winter when you need to bring a jacket, Glassman recommends a puffy, down-filled style that folds up and doesn't wrinkle—making it easy to stuff into the plastic bins at security and fit in the overhead space on the plane.