Nothing worse than fresh new bars, makes you look inexperienced.
Shhhh. You'll let out my secret. I always used to turn up with shiny new bars. That way the Captain had no expectations of me.
Of course it's hard to deny that you've had some previous experience as an F/O on the B744. I don't know what I'm going to do if I ever check out as a Captain. It's hard to have 'plausible deniability' then that I'm anything but an old codger!