I think if he already wears kilts for family events and heritage events then he should definitely wear one! But if he has never worn a kilt before and this is just coming out of nowhere I'd be more skeptical and think it would be a little ridiculous. But you know your guy best!
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Any dress you got will go with a kilt. When my FH first told me he wanted to wear his kilt, I thought I would need to change my color scheme to match. Then I googled the heck out of kilt weddings and realized they are pretty neutral (especially in Scotland weddings where they are all wearing their own family tartan)