I'm always cold when flying, so I just layer up. Jeans, sweatpants, short sleeve, long sleeve, sweater, jacket, hat. Then, I put various items in my various pockets. Phone, earbuds, snack bars, bar of soap, small articles of clothing, maybe a tshirt in my jacket pocket, a shoe in each sweatpants pocket. The rest goes in my carry on, no luggage fees.