I have two thoughts on this subject:

1. It's your's and, especially, your bride-to-be's wedding. Wear whatever you want. There are no fashion police who will give you a ticket for wearing a "regular" tie with a PC. In future years your wedding pictures will look just as lovely and invoke the same sentimental memories "cum or sans" the bow tie.

2. If you care enough about fashion tradition, then Jock is correct (as usual). Wear a bow tie or a black argyll jacket with a conventional tie. You will both be so happy (and nervous) on the wedding day that, hopefully, the cloth tie will be the last thing you think about. The vastly more important "ties" are the oaths you will swear during that sacred ceremony. In time the cloth tie will crumble. The sworn tie is immortal.

Have a great wedding!