For a long time when I was a kid my parents took me and my brothers to a pediatrician who would basically just have us loosen our clothes. If we had on a button-down shirt, we'd have to unbutton it the whole way. We would have to undo our jeans. Then we would have to go through the whole physical mostly like that.
Then one day our parents announced we were going to the doctor and, instead of going to the usual place, we went to this clinic in a hospital. My older brother and I didn't say anything but my younger brother asked why were at a different place. Mom said "we want you guys to have a complete physical this time." That made me nervous.
After all the preliminary paperwork, etc., my brothers and parents and I were taken to this exam room that was actually a small suite of rooms with a main exam room with a table, a side room that had lots of other equipment and also the stuff for eye tests, hearing tests, etc., and a second table where they did stuff like EKGs. There was also a bathroom off to the side.
The nurse gave me and my brothers cups and told us to pee in them in the bathroom, and after that he (a male nurse this time), took our temperatures and blood pressure. Then he said to my parents "the doctor will be in in a few minutes. Go ahead and have the boys get ready for him. We want them to take off their clothes and just have a seat. They can leave their underpants on - for now."
Underpants definitely came off pretty quickly after the doctor came in (the nurse came back in, too) and the other thing I think was cool is that after each of our turns was done, the doctor said "don't get dressed yet." We had to wait and stay like that for the shots and a few other things that came last after the doctor left (it was all done by the nurse and by a technician who came in). Then the doctor came back in, looked over the forms and notes, spoke to our parents and finally said "ok, they can put their clothes back on."