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Long underwear, often called long johns, is a style of two-piece underwear with long legs and long sleeves that is normally worn during cold weather. It offers an advantage over the union suit in that the wearer can choose to wear either the top, bottom, or both parts depending on the weather. Long underwear are also less commonly known as "long handles". Modern long underwear has largely supplanted the one-piece union suit. In the USA, it is usually made from a cotton or cotton-polyester blend fabric with a box-weave texture, although some varieties are also made from flannel, particularly the union suit, while many newer varieties are made from polypropylene, 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, as opposed to artificial fibres. 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 USA, two layers of only artificial fibres, which uses trapped body heat to insulate against cold air. An adjustable two-piece design is credited to Truro, Nova Scotia native Frank Stanfield of Stanfield’s Limited who patented his design on 7 December 1915. Earlier, in 1898 Frank Stanfield and his brother John had developed a product called Stanfield’s Unshrinkable Underwear. 
two-piece long underwear Undergarments or underwear are clothes worn under other clothes, often next to the skin. They keep outer garments from being soiled by bodily secretions and and discharges; shape the body; and provide support for parts of it. In cold weather, long underwear sometimes is worn to provide additional warmth. Some undergarments are intended for erotic effect. Special types of undergarments have religious significance. Some items of clothing are designed as underwear, while others, such as T-shirts and certain types of shorts, are appropriate both as undergarments and as outer clothing. If made of suitable material, some undergarments can serve as nightwear or swimsuits. Undergarments commonly worn by women today include brassieres and panties (also known as knickers), while men often wear briefs, boxer shorts, and boxer briefs. Items commonly worn by both sexes include T-shirts, sleeveless shirts (also called singlets), bikini underwear, thongs, and G-strings. 
Men’s boxer shorts
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