I don’t always agree with Plank but this is right on the money. From the moment you step into the hospital, be the professional - be confident, introduce yourself as “doctor” and stand up straight / look people in the eye (I’m always shocked at how bad folks are at this). Be courteous and friendly (even if it’s a facade!) to those you come in contact with.
When I started as an attending I made this a priority. Gone were the days when I showed up in ratty gym shorts and a brewery logo T-shirt of my residency days - I’m in them for all of 4-5 minutes but I remember thinking “gee, could that person at least try to look decent” of my staff that did that in training. And yes there is a difference between this and the put-together outfit of someone stopping by the gym on the way home. I considered wearing a suit each day but that was just too much, I settle for slacks and a dress shirt. This way I can meet with patients if I am running behind and change into scrubs while they are brought back. Notice I’m not saying that you need to be perfectly manicured and for the ladies a mask of makeup and an uncomfortable heels outfit... but do make an attempt to look presentable. I try to shave most days, at least. .
Anyway, this is what I do to keep up experiences. Your preferences may vary!