Thanks for the advice guys. Here's what I think I will wear:

-Black leather buckle shoes (NOT gillies or mary-janes)
-Argyle kilt hose
-Solid, navy blue flashes (they match the tartan)
-Dress sgian
-Kilt (duh)
-Black argyle jacket with silver buttons
-Wing collar shirt
-Black bow tie

Here's the advice I need from you guys. I have a black 5-button waistcoat. Should I wear that or rent a 3-button? Maybe no waistcoat at all? Also, what do you guys think of lapel pins? I was thinking of Rock Ivy (Gordon clan plant).