Underwear

Undergarments or underwear are clothes worn under other clothes, often next to the skin. They keep outer garments from being soiled by perspiration, urine, semen, feces, and other 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.

Underwear is worn for a variety of reasons. They keep outer garments from being soiled by perspiration, urine, semen and feces. Women's brassieres provide support for their breasts, and men's briefs serve the same function for the male genitalia; a corset may be worn as a foundation garment to alter a woman's body shape. For additional support and protection when playing sports, men often wear more tightly fitting underwear, including jockstraps and trunks. Women may wear sports bras which provide greater support, thus increasing comfort and reducing the chance of damage to the ligaments of the chest during high-impact exercises such as jogging.

In cold climates, underwear may be an additional layer of clothing that helps the wearer keep warm. Underwear can be used to preserve the wearer's modesty – for instance, some women wear camisoles and slips (petticoats) under clothes that are sheer. Conversely, underwear can also be worn for erotic effect. It is possible to purchase underwear made specifically for sexual titillation, such as edible underwear and crotchless panties.

Some items of clothing are designed as underwear, while others such as T-shirts and certain types of shorts are suitable both as underwear and as outer clothing. The suitability of underwear as outer clothing is, apart from the indoor or outdoor climate, largely dependent on societal norms, fashion and the requirements of the law. If made of suitable material, some underwear can serve as nightwear or swimsuits.

1970s to the present day
Underwear as fashion matured in the 1970s and 1980s, and underwear advertisers forgot about comfort and durability, at least in advertising. Sex appeal became the main selling point, in swimwear as well, bringing to fruition a trend that had been building since at least the flapper era.

The tank top, an undershirt named after the type of swimwear dating from the 1920s known as a tank suit or maillot, became popular warm-weather casual outerwear in the US in the 1980s. Performers such as Madonna and Cyndi Lauper were also often seen wearing their undergarments on top of other clothes.

Although worn for decades by exotic dancers, in the 1980s the G-string first gained popularity in South America, particularly in Brazil. Originally a style of swimsuit, the back of the garment is so narrow that it disappears between the buttocks. By the 1990s the design had made its way to most of the Western world, and thong underwear became popular. Today, the thong is one of the fastest-selling styles of underwear among women, and is also worn by men.

While health and practicality had previously been emphasized, in the 1970s retailers of men's underpants began focusing on fashion and sex appeal. Designers such as Calvin Klein began featuring near-naked models in their advertisements. The increased wealth of the gay community helped to promote a diversity of undergarment choices. In his book The Philosophy of Andy Warhol (1975), Andy Warhol wrote:
I told B I needed some socks too and at least 30 pairs of Jockey shorts. He suggested I switch to Italian-style briefs, the ones with the T-shaped crotch that tends to build you up. I told him I'd tried them once, in Rome, the day I was walking through a Liz Taylor movie – and I didn't like them because they made me too self-aware. It gave me the feeling girls must have when they wear uplift bras.

Warhol liked his Jockey briefs so much that he used a pair as a canvas for one of his dollar-sign paintings.

In the UK in the 1970s, tight jeans gave briefs a temporary edge over boxer shorts, but a decade later boxers were given a boost by Nick Kamen's performance in Levi's "Launderette" TV commercial for its 501 jeans, during which he stripped down to a pair of white boxer shorts in a public laundromat.

The 1990s saw the introduction of boxer briefs, which take the longer shape of boxers but maintain the tightness of briefs. Hip hop stars popularized "sagging", in which loosely fitting jeans or shorts were allowed to droop below the waist, exposing the waistband or a greater portion of boxer shorts worn underneath. The chiselled muscularity of Mark Wahlberg (then known as Marky Mark) in a series of 1990s underwear advertisements for Calvin Klein led to his success as a white hip hop star and a Hollywood actor.

In January 2008 it was reported that, according to market research firm Mintel, the men's underwear market in the UK was worth £674 million, and volume sales of men's underpants rose by 24% between 2000 and 2005. British manufacturers and retailers claim that most British men prefer "trunks", or short boxer briefs. The director of menswear of major British retailer Marks & Spencer (M&S), which sells 40 million pairs of men's underpants a year, was quoted as saying that while boxer shorts were still the most popular at M&S, demand was easing off in favour of hipster trunks similar in design to the swimming trunks worn by actor Daniel Craig in the James Bond film Casino Royale (2006).