A lot has changed in the last few years in a Big Airline and their Cargo offshoot in UK. On a night sector with a relief crew, quite a few of us often changed into track suit or 'bunk wear, when established in the cruise, before and after bunk time.
Now apparently uniform must be worn in the flight deck at all times. Quite what that rule has to do with Management, when the flight deck is off limits, and with a crew loo???