I don't know what the level of dress is for your upcoming nuptials, but unless the girls are in overalls, I would avoid the boots. (Of course, it's you wedding, so we always add the caveat, do as you please.)

But since you asked, I would recommend plain black oxfords or even loafers, depending on the level of dress. You can buy cheap shoes for 20 bucks to wear once and toss if you don't own a pair of real shoes and don't plan to wear them again. But--assuming that the girls will be all dressed up--you will look best in black shoes. REal shoes, not running shoes.

But then I only wear boots with a kilt if I am outside in ultra casual pursuits, such as hiking. And even then I wear proper kilt hose and flashes. I don't care for that ulta cool, chic high-boots-with-pushed-down-socks look.

Assuming that you are much younger than me, I imagine that you think me an old f@rt! You are correct. But appropriate dress is actually pretty timeless, and we don't want you looking at your wedding photos in 30 years with your grandchildren saying, "What on earth was I thinking?" In 30 years, no one will notice the black shoes.