PC Waistcoat Options: 3 vs 5 Button

[JSFMACLJR]

I think wearing the 5-button vest with the PC is mirroring the trend of wearing a waistcoat instead of a cummerbund with a tuxedo.

John, I almost always wear a three or four button evening waistcoat with a dinner jacket, instead of a cummerbund. I wouldn't call wearing a waistcoat with a tuxedo a "trend", unless it is one of those horrid looking waistcoats with five buttons favoured by the Hollywood set!