Well I am but I'm not proud of it. Boxer shorts in fact.... It is moving day to get the last of my x-wife's things out of our old house before we sell it. So boy jeans, oversized tshirt, with undershirt to hide the girls, and my old tennis shoes.... with boxer shorts out in the rain looking like a drowned rat.
I routinely wear guy underwear to work as well. It helps maintain the disguise as it were.