Check a clothing retailer's official website to find its size chart, which usually lists the corresponding inch measurements next to the numeric pant size. Most popular clothing companies offer brand-specific size guides that allow customers to accurately convert a pant size to inches.
As of 2014, clothing retailers have not adopted a universal sizing standard. The government's attempt at standardization in the 1930s lost traction by the end of the century, and clothing companies opted instead to devise sizing charts unique to their brands. J. Crew, Gap and American Eagle are just a few retailers that offer different waist and hip inch measurements for the same numeric pant size.