(Asbestos on...)
I'm not aircrew, not even a Regular, but do have a couple of comments to make:
Visited Ramstein last year, saw their AT tasking centre - aircrew in desk jobs, wearing flight suits. It didn't look appropriate to the job.
Likewise, seeing someone queuing to pay for the milk and biscuits in the Co-op dressed in a flying suit would not look appropriate - to me.
By all means wear a flying suit on the station if there is any chance of being called on for flying duty, but be prepared to change into work clothes in your time before the work starts - as many civilians have to do!