I think that in the UK officers have 3. combat, ceremonial/official, and evening ceremonial
More than that.
There's "working dress" (like fatigues; Olive green pullover, shirt, trousers. "Barrack Dress" Green trousers and light tan shirt, pullover, "Combat" (camouflage), number 2 (khaki ceremonial), No. 1 (ceremonial, usually dark blue, almost black) and Mess dress (usually dark blue with light coloured lapels). And perhaps more if they are from a specific regiment.
At least, that's how it was a few years ago when i worked in an officers' mess.