If positioning immediatly prior or after operating I may be in uniform but when commutting/travelling on stby I try to change or at least dress down with a jumper or similar.
If the operating crew offer an upgrade will quietly and gratefully accept but do the most not to abuse the privilage and only have the meals after full fare pax have picked. Stay clear of the free booze as well.
Have seen crew totally abuse the perk and had quiet words with my own crew members when they have been the offenders.
The bigger comfy seat is all one realy needs.
Thank you to all the crew/groundstaff who have looked after me in the past and hopefully in the future.