I commute every day in my bike shorts simply because it is more comfortable and no risk of damaging the office attire. Sometimes I take office clothes on the bike, but other times I keep them at the office. However, I nearly always carry the daily boxers with me.
Today, for some reason I can't figure out, I forgot the undies. I wasn't even rushed this morning, in fact, I had more time than usual. The ONE item of clothing I carry EVERY day, and I forget to bring'em. To make matters worse, I had taken home for replacement the emergency pair I keep in the office. Sooo, today I'm going commando under the dockers.
There ya go....now you know more than you really needed to know.