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There are multiple size types, designed to fit somewhat different body shapes. Variations include the height of the person's torso (known as back length), whether the bust, waist, and hips are straighter (characteristic of teenagers) or curvier (like many adult women), and whether the bust is higher or lower (characteristic of younger and older women, respectively).
There is no mandatory clothing size or labeling standard in the US, though a series of voluntary standards have been in place since the 1930s. The US government, however, did attempt to establish a system for women's clothing in 1958 when the National Bureau of Standards published Body Measurements for the Sizing of Women's Patterns and Apparel .
In the United States and Canada, the traditional system is similar to the British system but there are different zero points for children's, men's, and women's shoe sizes. The most common is the customary system where men's shoes are one size longer than the UK equivalent, making a men's 13 in the US the same size as a men's 12 in the UK.
In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.
The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country. The United Kingdom's system of measures evolved by 1824 to create the imperial system (with imperial units ), which was officially adopted in 1826, changing the definitions of some of its units.
The table of imperial avoirdupois mass is the same as the United States table up to one pound, but above that point, the tables differ. The imperial system has a hundredweight, defined as eight stone of 14 lb each, or 112 lb ( 50.802 345 44 kg ), whereas a US hundredweight is 100 lb ( 45.359 237 kg ).
U.S. customary units have been defined in terms of metric units since the 19th century, [1] and the SI has been the "preferred system of weights and measures for United States trade and commerce" since 1975 according to United States law. [2] However, conversion was not mandatory and many industries chose not to convert, and U.S. customary ...
The United States is the only ... deprecated use of the US survey foot and recommended conversion to either the ... with shoe size of 13 (UK), 14 (US ...