[1] Often they have a good water resistance, consist of multiple layers to protect and insulate against low temperatures.
[2] Winter clothes are especially outerwear like coats, jackets, hats, scarves and gloves or mittens, earmuffs, but also warm underwear like long underwear, union suits and socks.
[3] Military issue winter clothing evolved from heavy coats and jackets to multilayered clothing for the purpose of keeping troops warm during winter battles.
[4] Several shirts and socks, usually four pairs were standard issue for the U.S. Army during WWII.
Many northern cultures use animal fur to make winter clothes.