By all means wear your kilt in Scotland while you are there, if that is your choice. 19 days in Scotland on two trips, wore trousers one full day and another 5 hours when I was not allowed to wear a kilt on a major golf course (don't ask). Yes, native scots will tag you as a tourist pretty quick, but then they would have anyway from whatever you wore once they heard you speak. But the natives, at least to me, were complimentary to no limits, and interested and inquisitive as to why a 'yank would wear the kilt, but in a good way. As long as you wear it with the respect it is due, and a proper tartan kilt, no one will give you a second look or thought. Yes you will get stopped by all manner of tourists, American and others, with the others often wanting to have their picture taken with you in the major tourist areas---elsewhere less likely as less tourists. Even been stopped and asked for directions a few times. Shop owners typically love it, but then they have a reason for buttering you up, as do bar men and bar maids, etc... And depending on what type of tourists you run into you may be asked the "question". Deal with it as you will.

One suggestion---don't wear any flatcaps with your kilt up in Invernessshire, as I hear there is a madman up there who really goes off on flatlanders wearing the kilt with a flatcap.

Enjoy the trip.