Summarize this article in one sentence.
It can get chilly in airports, and it can also get cool on a plane. The temperature may shift and vary. So bring something warm.  Even if you’re going to a warm climate, bringing along a zip-up sweatshirt or a simple cardigan sweater is a good idea. Some knits can look pretty stylish. Dark clothing is better because it will hide spills that could happen on the plane. If you’re traveling in winter, you might want to bring a puffy down jacket if you have one because it won’t wrinkle if you need to place it into the overhead bin. To make your life easier, start removing layered items, such as a sweatshirt before you get to the metal detector. A lightweight jacket could also work. It depends on the bra, of course, but some underwire bras can set off airport metal detectors. That costs you time.  It’s also likely to cause you to have to succumb to a pat-down inspection. Not only are those sometimes embarrassing, but it will delay you. Instead, try metal-free bras. A simple padded brassiere could work, and sports bras are perfect for airport travel. If you like your underwire bra, just pack it in your suitcase instead of wearing it to the airport. Underwire bras could also be uncomfortable during a long flight. You’ll want to be comfortable at the airport (no stiletto heels!), but that doesn’t mean you can’t still look good. Victoria Beckham has said the airport is her runway.  Lots of people end up in the airport in sweatpants or a track suit because they're so comfortable. If that's not for you, try a nice pair of leggings instead. Match them with long sweaters, hoodies, or long tops. You can dress up a dressed down look by carrying a nice, statement handbag. Celebrities tend to wear sunglasses inside airports a lot and hats too. Go for comfort but with style. Wearing jeans can be a good choice in an airport. However, wear worn jeans that don’t have too tight of a waistband and are worn in. Celebrities walk through airports all the time, and they manage to look both comfortable and stylish. Try relaxed trousers with a blazer like actress Cate Blanchett. Try jeans with flats and a simple black blouse like the model Miranda Kerr. Loose sweaters are extremely comfortable, especially if you pair them with jeans or leggings. Loose fitting dresses or pants are also a good choice for flying.  A loose sweater will keep you warm and will feel comfortable, including if you end up sitting in the airport or on the plane for hours. If you want to wear a skirt, go with a long maxi skirt and don't choose anything too tight and short. Wear an oversize pashmina scarf with the sweater (or just with a shirt) and it can almost double as a blanket on the plane. The other benefit of loose clothing is that it can help prevent blood clots. Although synthetic clothing can be flammable, it's also less likely to wrinkle, which can make it a good choice for planes. A graphic T-shirt is another option if you’re in a warm climate. It’s casual but still trendy, so you will look stylish without sacrificing comfort. Avoid T-shirts with offensive sayings, though. It could cause you trouble in an airport. Often when you’re traveling, you will be shifting between different climates or temperatures. Maybe you’re going somewhere warmer or colder. Or maybe the temperature on the plane will shift. Come prepared.  If you layer clothes on your body, you won’t have to pack as much.  You can remove one layer (say a sweater) and enjoy the tank top underneath once you land somewhere warmer (or vice versa). You should dress for the colder climate if you’re flying between locales with different temperatures. Wearing a Pashmina, shawl, scarves, or wrap can be turned into makeshift pillows, allowing you to sleep more easily on the plane, if necessary.  Get prepared for the plane to be cold at times even if the climate outside is not. You will also want to wear fabrics that breathe and allow air to pass, such as silk or cotton. You will feel cleaner and fresher for longer.

Summary:
Bring a sweater. Wear a bra that has no metal in it. Wear comfortable bottoms. Wear loose clothing. Layer it up.