Wasp waist is a women's fashion silhouette, produced by a style of corset and girdle, that has experienced various periods of popularity in the 19th and 20th centuries. Its primary feature is the abrupt transition from a natural-width rib cage to an exceedingly small waist, with the hips curving out below. It takes its name from its similarity to a wasp's segmented body. The sharply cinched waistline also exaggerates the hips and bust.
In the 19th century, while average corseted waist measurements varied between 23 to 31 inches, wasp waist measurements of 16 to 18 inches were uncommon and were not considered attractive. Ladies' magazines told of the side effects of tight lacing, proclaiming that "if a lady binds and girds herself in, until she be only twenty-three inches, and, in some cases, until she be only twenty-one inches, it must be done at the expense of comfort, health, and happiness." Instead, fashions created the illusion of a small waist, using proportion, stripe placement, and color. Extreme tight lacing (15"-18") was a "fad" during the late 1870s/'80s, ending in around 1887. 
Among the multitude of medical problems women suffered to achieve these drastic measurements were deformed ribs, weakened abdominal muscles, deformed and dislocated internal organs, and respiratory ailments. Displacement and disfigurement of the reproductive organs greatly increased the risk of miscarriage and maternal death.
- Chavasse, Pye Henry (1863). Advice to a Wife on the Management of Her Own Health, and on the Treatment of Some of the Complaints Incidental to Pregnancy, Labour, and Suckling; with an Introductory Chapter Especially Addressed to a Young Wife (5 ed.). London: New Burlington Street: John Churchill and Sons. p. 19. Retrieved 29 January 2018.
- Kunzle, D."Fashion and Fetishism", Accessed June 20, 2007
- Klingerman, K.M. "Binding Femininity: The Effects of Tightlacing on the Female Pelvis", Accessed June 20, 2007
- O'Connor, E. "Medicine and Women's Clothing and Leisure Activities in Victorian Canada", Accessed June 20, 2007
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