Long underwear, also called long johns or thermal underwear, is underwear with long legs and long sleeves that is normally worn during cold weather. It is commonly worn by people under their clothes in colder climates.
In the United States, it is usually made from a cotton or cotton-polyester-blend fabric with a waffle weave texture, although some varieties are also made from flannel, particularly the union suit, while many newer varieties are made from polyester, such as the Capilene trade name.
European manufacturers use wool blends or even 100% wool, usually Merino or other high-quality wool. Some models might include a thin layer of polyester to transport moisture away from the skin. Wool, in addition to being fire retardant, provides highly effective insulation and will keep its insulating properties even when wet, unlike cotton.
The type known as "thermal underwear" is made from two-ply fabric of either a wool layer and an artificial fibre, only wool or – again mostly in the U.S. – two layers of only artificial fibres, which uses trapped body heat to insulate against cold air. They are typically skin hugging, but not compression, to better trap air near skin for insulation and wick away moisture.
In 2004, Michael Quinion, a British etymology and writer, postulated that the john in the item of apparel may be a reference to Sullivan, who wore a similar-looking garment in the ring. This explanation, however, is uncertain and the term's origin is ultimately unknown.Michael Quinion (21 February 2004). World Wide Words . Retrieved 5 August 2011.
It has also been posed that the term is an approximation of the French longues jambes, which translates to 'long legs.'
It was first used as loungewear but later became popular in Truro, Nova Scotia. In 1898, Myles and his brother John Stanfield had developed a product called Stanfield's Unshrinkable Underwear for their garment manufacturing company. He and his brother started with non-shrinking cotton underwear and applied for a patent for long johns on December 7, 1915. From 1914 to mid-1918, the item of underwear most purchased by various military forces was a garment known as a union suit; it is a one-piece form of underwear covering body and legs and was the prototype of the Chinese (秋衣), the top part, and (秋裤), the bottom part. After 1918, countries returned to producing for civilians.
Demand declined following the spread of central heating and more frequent baths or showers.
In the early 2010s, a myth spread through Chinese social media that long underwear was part of the Soviet Union's conspiracy to prevent Chinese military powers from invading Soviet soil in the far east. The myth suggested that the Soviet Union believes that long underwear reduces Chinese soldiers' adaptability in cold climates based on the since-debunked theory of Lysenkoism popular in the mid-20th century.
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