Why no belt with PC / Vest?

[Bugbear]

Now my thought was that an Argyle with the metal buttons was the equivalent of a tuxedo (dinner) jacket, while a Prince Charlie was the equivalent of a tailcoat. Either could be worn for black tie, but only the Prince Charlie (or a doublet) for white tie.

Three button waistcoat and bowtie for black or white tie (in the appropriate color of course), five button with a regular 'four-in-hand' tie.

I used to think that at first, but I was wrong. It is a bit confusing because you can dress down one step in formality and still be acceptable.

I was only saying that a Prince Charlie, and I'm going by the description of the components, does not look like a tuxedo with the tails chopped off and the satin buttons replaced with silver buttons in the same number and place. I can't look at the pictures, so I may be completely wrong.

I know now that the PC is worn when a tuxedo would be worn, so I'm not argueing about that; just that anything worn with a tux would not necessarily work with a PC.