It's not, in fact, it's quite embarrassing. You've done this for the last several years and any of the charm it originally had died the first year you did it. Now you have made it acceptable for other morons to do the same stupid shit, i saw about 4 different groups of people(the vast majority being male) running around in nothing but underwear last year. Stop. You look fucking stupid, its not endearing in any way,shape, or form.
The worst is having to stand next to one of these dickshitters at a set later in the afternoon after all their nard sweat has soaked into nothing but their underwear throughout the day so now anyone within a 5 foot radius has to put up with your dick musk in the 90+ degree heat for 45 minutes before the set is through.