Air NZ jet and regional wear uniform. Was explained as a mental mindset reason behind it all, put on the uniform, you go into work mode etc.
There was an emergency when a engine shat itself on takeoff at Wellington a few years ago and the PM reverted to using the call sign we’d always used in the SIM, the only time we really do EF. Although the pilot and company were stoked to see the training worked in practice it was decided to use random flight numbers in the sim from then on because of the way the memory recall actually created a bit of confusion with the use of one simulator call sign.