I purchased the navy and brown in a S.  My usual size is XS. I have the style that looks sort of like a mix between a crew neck and mock neck. The fit is similar to the model in the photo, it is close to body, snug around bust and a bit roomier around the waist.  They just fit with no room to shrink so I have been washing them carefully on delicate cycle and taking them out of the dryer before completely dry.  They wash up nicely. I smooth them out and reshape on the bed and then put them on a hanger to dry. I think I may try a M if I order again so I don't have to be so careful when I wash them.  From the other reviews it seems the sizes are not consistent but I recommend ordering 1-2 sizes up.  Nice sweater for the price. I am wearing it under flannel shirts or open sweaters now but if we ever get a spring I'll wear it alone.