I'm conducting a wedding service Saturday at a Celtic Festival. I've officiated Scottish-style weddings before,where the parties have been dressed formally and therefore I've worn dress jacket and waistcoat to match formality with the wedding party.

At this wedding, however, the groom will wear a ghillie shirt with his kilt and the bride will wear a nice-but-not-formal dress. I think if I wear a formal jacket/tie/waistcoat that would appear incongruous with the bride and groom---too formal. Yet, I don't want to wear my own ghillie shirt (I feel like the official should look rather more...official?) (BTW, I'll be wearing a bespoke 8 yard kilt and nice daywear sporran).

So, for this ceremony...Button down shirt? Tie or no tie ? Waistcoat but no jacket? Or....??? Fellow X Markers, I appreciate any advice you can share with me.