Here's the thing.
Technically you're supposed to wear a 5 button waistcoat and tie/cravat with an Argyle jacket and a bow tie and 3 button waistocat with a PC.
But... and this is a big but... It's YOUR wedding.
If you actually go to a kilt hire place and say 'Hey, I'd really like the PC jacket but a 5 button waistcoat and a cravat to match my flashes.' they'll usually accomodate you with minimal extra cost.
I, personally, hate bow ties. They make me look like I have no neck. So I would always try to wear a tie and a 5 button with my PC when I was wearing it.
The thing is, for all that I love tradition and respect it and will tell people not to wear their kilt sideways or down to their ankles or whatever, it's clothing.
It's your clothing and your wedding and your pictures. So wear it how you want it as long as you are comfortable and happy and wear it with pride.