There is a popular misconception that the PC is at the top of the range - it is not. It is mid-range at best. Men want to wear their best for a wedding and mistakenly choose the PC as that jacket.

If we start at the bottom and work up.

1 - Tweed Jacket, no waistcoat - Day Wear

2 - Tweed Jacket, with a waistcoat (5 button) - Day Wear

3 - Black Argyle, no waistcoat - Day Wear

4 - Black Argyle, with a waistcoat (5 button) - Day Wear

5 - Black Argyle, with a waistcoat (3 button) - Tuxedo Equivalent - Black Tie

6 - Prince Charlie, no waistcoat - Tuxedo Equivalent - Black Tie

7 - Prince Charlie, with a waistcoat (3 button) - Tuxedo Equivalent - Black Tie

8 - Regulation Doublet - with a waistcoat (3 button) - Tuxedo Equivalent - Black Tie

9 - Sheriffmuir, with high cut waistcoat (6 button+) - Black Tie or White Tie

10 Montrose, no waistcoat - White Tie

NOTE - There are 1/2 and 1/4 stages in between each number.
a - Brown and Green Tweed is seen as 'Country' or 'Rural', whereas Blue and Grey Tweed is seen as 'In Town' and 'Business'
b - Waistcoats that are matching the jacket are one step higher than waistcoats that are complimentary colours.
c - Waistcoats that are bias cut tartan rank higher than straight cut tartan and both are higher than those in b.
d - Leather buttons are better than plastic, as are real horn or antler.
e - Real silver buttons are higher up the chain than steel cut and the buttons in d.
f - Argyle style jackets come in a variety of colours

These are just the major variations. There are dozens more subtle variations that are often not seen, but known only to the wearer.

The point being that the PC is a tuxedo equivalent. You wear a PC and you, more or less, have to wear a bow tie. Because that is what you wear with a PC.

One last little point, but the biggest overall. Are you intending on being an equal partner in your marriage? If yes, then you should really decide what tie you will wear.

Regards

Chas