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Long underwear usually refers to a style of two-piece underwear with long arms and long legs that is worn during cold weather.
Most long underwear of today, also known as "long johns", is made with a box-weave, although some is also made of flannel, while others are made of two layers, sometimes called thermal underwear.
Modern long underwear is a modern innovation, largely supplanting the old union suit worn almost exclusively by men.
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