Rhinoplasty Operation. Can You Wear Underwear and Socks During the Procedure?

I am having an open septo-rhinoplasty procedure on Monday and am very nervous so have been researching everything possible on the internet about it (which probably isn't wise!). I have come accross quite a few people claiming that during surgery your hospital gown and underwear is removed, which I found quite shocking! I wanted to know, first of all, whether this was true and if so why, and secondly, if it is not true, is underwear and socks allowing during the procedure?