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.
Long underwear, often called longjohns, is a style of two-piece underwear with long sleeves and long pantlegs that is normally worn during cold weather.
Modern long underwear has largely supplanted the traditional union suit.
It is usually made from fabric with a box-weave texture, although some varieties are also made from flannel.