There's only one rule with a vest/waistcoat- never, ever do up the bottom button. Do up all the others. Now, enjoy that vest.
Favourite Bowie looks are-
1- the 'Let's Dance' suit (complete with snooker referee gloves which he STILL wears when miming the guitar!).
2- the 'Ashes to Ashes' Pierrot clown style.
This week, I've mostly been wearing the tux again as the 'Winter Dance Party' tribute trundles on. Cufflinks are a must in formal and turbo-casual settings and should not be feared. They never get in the way. Of any endeavour.
Congratulations to Xraycat on that great new appointment.