Let's look at this - manly. This is your one true love, to be honored, respected, loved, for better or worse - until death do you part. Correct? At what part of honor or respect or loved does - but I want to wear my kilt

enter into this formula?
Additionally have you sat around for 20 or 30 years planning that special day when you will be ONCE walked down the aisle, your father on one arm your groom waiting longingly - in his tux - at the altar?
Most guys don't want to have anything to do with the planning or execution of his wedding - and everyone knows it. So why all of a sudden would a man want to be in on the minutia of planning a wedding - down to the clothing???
If the kilt is familial, historical, worn for honoring family heritage and done so regularly it is certainly different than when worn to be different, visible, flashy or for fun. If the OP wears his kilt for the first reason I believe his bride-to-be will soften her stance and permit the kilt. If it is the latter then no harm no foul.
Additionally (and finally) this is one reason why most pastors won't marry a couple unless they schedule pre-marital counselling. All the little unspoken, and sometimes spoken, wants, needs and desires can be explored prior to that special day to make sure no feelings become hurt approaching or after the wedding.
If this day wasn't so special or pre-planned to her she wouldn't care what he wears. The expression "be a man" has been lost on many of our culture. Many men no longer have the ability to get past their little feelings being hurt and sulk to a point where a day as special as their wedding can be potentially marred if little Johhny can't wear his favorite sneakers to the ball.
This is NOT the case of the OP, he already said that in the end what his fiance wants will be..... thank goodness.

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