I think a lot has to do with the guest and how well the people know the guest. For my sister's wedding, I was a groomsman and had to wear a tux. My sister brought along the tux return bag because she knew me well enough that I was going to change after the pictures. Almost everyone there knew me and was at my kilted wedding. No surprise. If I was invited to a wedding as my wife's date, and I knew noone there and they didnt' know me, that might be different....

But as to every wedding I've ever seen, someone standing in the crowd wearing a kilt will never never EVER keep people's eyes from the bride as she comes down the aisle.

One thing mentioned in the other thread was the dress code on the invitiations. I've never seen a dress code before, except for bridal party/groomsmen. There are expected levels of formal dress (that are not followed by at least some guests), but details aren't specified... and as said a few times before there are kilt options for all levels of formality that would be requested...