We use unisex shirt and sweatshirt.For women sizing, we recommend a normal size if you like a relaxed fit. For an oversized look, select 1-3 sizes larger than your normal size. We do not recommend sizing down unless you want a slim, fitted look.For men sizing, this shirt will be fitted. For a relaxed fit, size up.Sizing Tip: Grab a well-fitting shirt out of your closet and lay it flat. Measure from armpit to armpit and compare to the size chart to get your perfect fit for you.General size guide:S:       Size 4-6M:      Size 8-10L:       Size 12-14XL:     Size 14-162X:     Size 18-20