The uniform will be dictated by your job. Remember, the Luftwaffe not only flew and maintained aircraft, they also manned flak batteries in big numbers, put together a couple of notional ground divisions, and made coffee for the Army. Uniform of the day will be different, depending on what you're doing.
As a USAF firefighter, I wore BDUs on a daily basis. No one at all would mistake me for a B-52 crewman, whose UoD was flight suits all day every day.