There's no exact conversion method for men to women's underwear sizes, but with a little sense and the right size charts, you can figure out the best size for you. Men's underwear—briefs, boxers and ...
I think MeUndies underwear runs small compared to other brands, but the size chart is accurate ... You'll find underwear in men's sizes small through 4XL and women's sizes XS through 4XL.