I think that Ghillie style brogues also polarise opinion!

The options for footwear are as wide as the options as when you are not kilted; you can basically wear the same footwear as you would normally wear; it is simply a matter of taste. Most well dressed Scottish gentlemen will wear a good pair of leather shoes (not in a specific "Highland" pattern) often, but not exclusively, in black. I always think that a decent pair of "normal" brogues goes particularly well with the kilt but then that is what I would wear anyway. Wellies are also an option if the terrain and weather calls for them!

Have you considered a "normal" shirt and jumper for when you want to wear the kilt less formally?