AITA for swapping suits between the wedding ceremony and reception?

So, a few years ago when my grandfather passed, I inhereted his pinstripe suit and vest, and only because I'm the only one who matched his build and height. It's a bespoke Connolly he had made nearly thirty five years ago and it still looks brand new and stylish today. I have no idea how much it is worth exactly, I just know it is probably at least one order of magnitude more expensive than any other clothing I own, probably to the tune of mid to high four figures. Like seriously, take a look at Connolly's prices for casual wear and you will dump a brick.

So Ive got a rule: It's ceremonial. I wear it to look awesome at a wedding ceremony or funeral, for pictures, and basically any event where I have to do nothing but walk, smile, and where there is no food or where dancing and merrymaking might ruin it.

I've got another pinstripe suit I paid maybe $300 for that is tailored as well, but it makes me look like a Wish dot com version of myself compared to when I'm wearing the real deal.

So last weekend I was at a wedding for my cousin. As usual, I showed up in the blingsuit for the ceremony and wedding photos, and when we went from the ceremomy to the reception, I did the swap because it was a buffet with an open bar and dance floor. Cousin's new wife didn't notice for the first hour, then when she did she went full Bridezilla and demanded I change back into my proper suit so I wouldn't look bad in the background of her reception photos. I refused, and she told me she'd kick me out if I didn't change.

I told her I'm not ruining a suit more expensive than her wedding dress to look nice in the background of a few selfies and dipped, and now that part of the family has been blowing up my phone for ruining the wedding.

AITA?