shorts? Or similar shorts from one of the competitiors like Russell, Nike or Adidas?
They are not superlight but they are light, way breathable, and there is plenty of room in 'em.
I'm 6-0, 212, with a 36-inch waist, and close-set strong upper thighs, and the "L" was more than sufficient.
I'm not a name brand kind of guy, but I've been wanting to give that type of fabric a workout ...