What does the patient wear to the operating room?

A patient properly prepared for the operating room wears only a hospital gown. Some hospitals let patients wear underwear, but they are removed anyway because the nurse needs to insert an indwelling urinary catheter. There should be nothing in the hair, no polished/fake nails, no powders/lotions or perfumes, no jewelry even a watch. Oh and most patients wear footies to keep their feet warm.