Good Luck! I'm wearing my Gordon tartan to work today too. I'm going to wear it semi-formal since I do deal with the public and I want it to dazzle. I know the women will swoon and the men will raise an eyebrow, however, the one guy who has called it a skirt in the past was a male stripper back in the 70's, so he has no room to talk!! If he asks me what I'm wearing underneath, I'll just say "A G-string I got out of your closet!". Make it a great kilted day and make sure you emphasize that your kilt is not a "costume".
Cheers! RB