Dave,

I'd go for trews as well, but I wouldn't go for the MacIan tartan...personally, trews look better in a dark tartan...but that's just me. Government Sett (Black Watch) tartan makes the best trews, but Stewart Hunting, Leslie and Mackenzie also look good.

That's a tough call...if you go with the Government Sett, then it's less likely to attract her attention (and others) at the ceremony and possibly cause an "incident".

If it's an evening wedding, you could always wear your formal rig with trews, a la Hector in "Monarch of the Glen".

Cheers,

Todd