In most cases, the Father of the Bride will wear the same suits as the Groom, Best Man and Ushers and this is more likely to be the case if, as you say, the wedding is formal. However, the decision about the male outfits really rests with the Groom so he should have the final say on this one.

If this is a formal wedding, a tuxedo would be appropriate. If the bridal party are wearing kilts then I suggest the father of the groom to also wear a kilt.