Regards the AAC,
Working dress is the order of the day. For ground crew this is CS 95 and for aircrew this is flying suits for a normal working day.
PPE relevant to engineers, MT and apron operations is generally adopted when at work.
Aircrew coveralls are generally peridically maintained and if found worn, POL contaminated or the like they are replaced post haste so it is not considered to be an issue for use in the messes for lunches etc. and until a certain time in the evening in the bar whereas work coveralls might be.
A grown up, mature attitude that appears not to be as devisive as it is in other services......
HEDP