As said above the kilt is typically worn by Scots only for weddings, funerals, games, and other special occasions. Most scots don't even own a kilt. So anyone wearing a kilt, aside from being a part of the above activities, is going to be seen as out of the norm, regardless of whether you are in Iowa or Idaho or Scotland, and you will get some strange looks, especially if you are in a non-traditional kilt or wearing it in an inappropriate or slovenly fashion. As stated above, wear the kilt with proper kilt hose and flashes, comfortable and attractive footwear, and some form of attractive top---tweed jacket and buttondown shirt if you would like, sweater or cardigan, or even golf or polo style shirt. As long as you are wearing the kilt with pride and proper reverence to its heritage, and treat folks appropriately, you should be fine.
Jeff