I'm not a "full time kilt wearer" and usually only wear Highland Dress when I'm working as a piper. However, I've not owned a suit in over 20 years and on those rare occasions when I attend an event where a suit is expected I wear Highland Dress. (Black Argyll jacket, kilt, black fur sporran, charcoal hose for a rather muted look).

Come to think of it, I've only attended two weddings over that time that I've not played pipes at, and at one of them Renaissance costume was required. (I wore a full normal Renaissance outfit, no kilt.)

At the other, no one seemed other than pleased at my appearance. I knew most of the people well and they expected the kilt anyway.

It's actually difficult for me to imagine a bride so obsessed with holding 100% of everyone's attention that she must dictate to guests how to dress. A person that self-absorbed isn't going to enjoy her own wedding no matter how it turns out.