I've seen several topics that touch on traditional formal outfits and graduations or other events on school grounds, and I thought I'd bring up a fact I had to consider when giving a pocket knife to my step-daughter when she moved to college.

Check the local laws concerning knives on campus. The California laws forbid the possesion on campus of any folding knife over 2" (I think) or any solid knife, they even had to write a special exemption into the law for kitchen knives in the dorms. If it's a high school campus, the "zero-tolerance" policies in effect here would extend that proscription to any "look-alikes" as well.

If an up-tight rectal-cranial inversion type decided to get offended at the kilt, they could technically pull someone from the event and have them threatened with arrest over the sgian dubh.