Wool Flat Cap... a no-no with a kilt?

[Droid]

Just so you know, many in Scotland, particularly in the Highlands would not consider a flat cap, or button down collars as kilt attire. What you decide to do, is entirely down to you.

I was planning on, because it's a tad cooler in Scotland than California, wearing a button down shirt under the sweater. What else would one wear under a sweater?