I've answered the door in my underwear a few times before, when I don't have a pair of pants ready, because I would feel rude to keep them waiting. I've never really noticed much of a reaction before, but tonight the pizza guy was clearly very uncomfortable, even physically taking a couple steps back when I opened the door. I tried to just sign the receipt and take the pizza quickly so he could leave, but I started feeling guilty. When I told my wife, she basically said it was shitty of me answer the door like that. 

I've never really thought twice about it, and have seen enough stories from pizza delivery people that I just figured they've all seen much worse, so they wouldn't mind, but should I start taking the time to dress more?