Originally Posted by anabolism

Personally, I almost always take my shoes and socks off as soon as I'm seated, but I always have flipflops in my bag that I put on. I would *never* walk around the plane barefoot, because of how disgustingly dirty the carpets and floors are. But, that's because I don't want my feet to get dirty; it wouldn't affect anyone else either way.

BTW, I often take my shirt off as well, but since I'm always wearing a T-shirt of some sort underneath (usually a colored one with the name of some company that went out of business) I figure it's OK.