I’ve done it before. I used to not even think twice about it. But after reading the thread about people not like to see people to put their feet up – which I don’t do, I started to think maybe there is dress code, unspoken maybe, for business class at least, that I should pay attention to. Heck, flying between warm climates, I’d love to dress comfortably. But I guess changing into jeans and loafers won’t be too bad if I am asked to.