If me and my fiance met at a renaissance fair and we wanted to wear renaissance clothes for our catholic wedding is that allowed (you can bet our parents will try and stop us though)
I can see a Renaissance flair in the wedding attire, but I would definitely discourage couples from wearing anything too “costume-y” for a Mass.
Example: you could go with something like this with a matching veil and Renassaince-esque hairdo:
but not this:
FWIW: I had my wedding theme be “Traditional with Generic Celtic undertones”. For my outfit, I had a very traditional/basic wedding dress. But for the Celtic “flaire”, I had my hair put in many little braids (which were tied up in a bun), had flowers clipped in, and I wore a Celtic/Renaissance inspired headpiece:
And then we had our reception at an Irish pub in the city as part of that theme (as pictured).
Period costumes should stay in their respective situational events; the Mass is not one of them. BUT, that doesn’t mean you can’t use the theme for inspiration in your clothing, or that you can’t switch out to Renaissance attire and fun for the Reception. Perhaps that could be a good middle ground? I’m sure if you do more than the two minutes of googling I did for ideas, you’ll find some cool stuff out there to try out.