It really is up to the couple hw they wish to dress. The first one I performed was in Australia. My Friend Ian who asked me to do it, is Scottish, he wore a kilt to his.
It is not a legal union, not the ones I done, as I don't have a license. but it's enough for those who choose to do it. You could have the hand tying incorporated to a more modern marriage and then it would be legal xxThank you @amberkashif.