Vanity sizing

Vanity sizing, or size inflation, is the phenomenon of ready-to-wear clothing of the same nominal size becoming bigger in physical size over time. This has been documented primarily in the United States and the United Kingdom. Vanity sizing tends to occur where clothing sizes are not standardized, such as the U.S. market. In the United States, although clothing size standards exist (i.e., ASTM), most companies do not use them any longer.