At Wilford Hall: BDUs (fatigues) to and from work on weekdays that you are not on call; semi-professional dress--or BDUs if you're lazy and don't want to think about your "outfit"--on weekends (no jeans, usually slacks & a polo for guys); scrubs in the hospital whenever you're on-call. Of note, at WHMC active duty aren't allowed to wear scrubs or your white coat outside the hospital so you have to walk into/out of the facility in jeans or whatever, then change into your scrubs. This is a ridiculous rule because there are tons of civilian nurses and docs walking around that are clearly unaffected by this rule. If you happen to be a surgical resident doing cases at multiple facilities this can mean ALOT of clothing swaps throughout the day...(BDUs to work, scrubs for procedures, back to BDUs to drive to University, scrubs again, etc...) For a while this summer they were allowing folks to come to work in their fitness gear, but when EVERYONE was walking around in t-shirts and wind-pants they changed the rules again.
Additionally, the less-experienced of a physician you are the more likely you seem to be to wear a whitecoat...interns carry the most stuff, staff just put some notecards and a pen in their shirt pocket and borrow a pen-light or stethoscope from the medical student/interns, lol.