There's two ways to go:

1) If you are shameless, deck yourself and as many others as possible in Utilikilts. She would hate the kilt and the "rough" non-formal look of the utilikit. This is contingent on not caring what a large group of family and friends may think.

2) Crucify the woman with magnificence, luxury, and formality. Forget PC's. Go straight for a montrose or sherrifmuir (sp?) doublet. Drag out a fly plaid as well just to wow the guests. You'll be able to pass as an impressive highland lord, while the bride will have to keep her mouth shut in the face of the numerous compliments you receive or risk being exposed as a buffoon.

BONUS

Give a kilt as a wedding gift to the groom.