Use the Fabletics size charts. Click the "Size Guide" link next to any item to see the chart for that style. Fabletics women's sizes run from XXS to 4X, and men's sizes run from XS to 4X. Select styles also come with various inseam options, such as Short and Tall.
Customer reviews add fit notes from other shoppers. Fabletics Scrubs have their own women's and men's size guides.