Women's Apparel Dual Size Guide L covers sizes 14-16. XXL covers sizes 18-20.
As an average, a Medium is likely to be a around a size 12. Generally a Small will be an AU 8-10 and a Large an AU 14-16. An Extra Small is likely to be a size 6, with an Extra Large likely to be a size 18.
While a size XL is designed to fit a size 16/18, she may prefer to wear a size 1X which equates to a size 14/16.
What is women's US dress size 16 in the UK? US size 16 in women's dresses is UK size 20. This is equivalent to the XL international size. This dress size has a bust of 108-113 cm (42-44.5 inches), a waist of 90-85 cm (35.5-37.5 inches), and a hips size of 113-116 cm (44-45.5 inches).
Men's Shirts
We measure our shirts the traditional way, using collar sizes, so you will see our shirts quoted in inches - 15" (small), 15.5" (medium), 16.5" (large) and 17.5" (extra large).
Small (S): 36-38 inches. Medium (M): 39-41 inches. Large (L): 42-44 inches. Extra-Large (XL): 45+ inches.
"M" (medium), "L" (large), "XL" (extra large), "XXL" (extra extra large).
According to the U.S. Department of Health and Human Services, the average woman wears a size 16 (typically translated to an XL); this has historically represented the end, or the beginning of the end, of many apparel size runs, when, logically, it should be the very middle.