Someone once said that anticipation is what drives men wild. The clothes are only a tool to drive that anticipation. So the key is to build anticipation.

Seeing nipples protrude from under a silk nightgown... A dress that exposes just enough leg to hide the inner thigh and panty line... A peeking nipple from a bra... A tight pair of pants that reveal a shapely ass... A long shirt with nothing underneath... Or even jeans and a tight shirt that reads "No Bras, No Panties!"

It's the anticipation!!! So I suggest testing a variety to find what works best... It maybe just teasingly changing outfits in front of him.