I can't remember which Trevor Thom it was in, but I thought it was :
1 stripe - who cares ?
2 stripes - junior FO
3 stripes - senior FO
4 stripes - El Capitano
5 stripes - Captain having spent too long the night before with Mistress Whiplash
5 stripes plus red ring - see 5 stripes but went along to MW's with senior flight attendant
FF