After working through a closet full of other brands, I stick with Assos. They are cut to fit very fit cyclists in the riding position. I'm about your height and weight currently (6', 185 lbs.) and the Large still fit me, but I"m UP from 163 lbs. You should try both L and XL. PI are more American fit (height and wt) and the Italian and Spanish companies usually are better for shorter, slimmer riders.