I'm working on a story set in the TOS movie era (post-Wrath of Khan) and I need help understanding who would have worn what division color on the bridge of the Starship. I've linked two bridge layouts below (a Connie variant and an Excelsior) with the crew positions labeled. My biggest problem is figuring out Tactical wore and who besides the Captain wears Command white. Any help on this would be great!
Due to the time period, we're talking about the maroon uniforms. Immediately post Wrath of Khan is still early enough that they haven't abandoned the undershirts - the uniform seen on the crew of the Bozeman (circa 2278) appears to be complete, while later uniforms seen on the crew of the Enterprise-C (circa 2344) and on Jack Crusher (circa 2349) omit the undershirt.
As you've already mentioned, a 2270 era captain is the only person who regularly wears white aboard ship. According to Memory Alpha, other than medical sciences (green), cadets (red), and helm or engineering officers (explicitly separated from the other operations staff with gold), everybody else wears grey.
On the Constitution class, you have:
White - Commanding Officer (15)
Gold - Engineering (3), Propulsion (4), Damage Control (5), Helm (14)
Grey - Communications (2), Auxiliary Systems (8), Defense Systems (9), Weapons Systems (10), Tactical (11), Science (12), Navigation (13)
I've deliberately skipped Environment (6) - it is equally plausible for such a station to be occupied by an engineer, scientist, or even medical sciences crew.
I've flagged the combat related positions as grey as well, because they're clearly none of the others. Anecdotally primarily due to the change in uniform, Chekov was the weapons officer during the first film, and wore grey in all the other films.
The dedication plaque (0), master systems display (1), main viewscreen (7), space suit locker (16), and airlock control (17) would look pretty silly in uniform. The upholstery and carpet involved can vary, though.
Helm is renamed Conn (short for flight control), so the only truly new element is "Mission Ops". A little further in the future, but TNG Technical Manual hangs mission ops on the first word, mission. What kind of officer would occupy the station depends on the currently active mission - sometimes, it isn't occupied at all.
Wrath of Khan took place around 2285. You can consult memory alpha for more uniform details than you'll probably know what to do with.