I've seen them worn both ways.....which is preferred?
-- flat side against compression shorts....ref shirt over "nubs".....slacks over all. (This keeps the shirt in fine....but you can find yourself still tugging at your waistband every now and then to keep the waistband up on your waistline.
-- flex belt flat side against ref shirt.....tuck in shirt to slacks.....nubs against the slacks. (I find this to accomplish both....keeps shirt tucked in and nubs hold slacks from sliding below waistline.)
