Quote Originally Posted by MacMillan of Rathdown View Post
Don't do it. Here's why:

Since a belt isn't required to hold up a kilt, there is no practical reason for wearing a belt when kilted, except when wearing a dirk. As has been pointed out by Slacker Drummer, if you are going to wear a dirk then the belt goes over, not under the waistcoat.

If the waistcoat is properly cut, and if the rise of the kilt is correct, the waistcoat would completely cover the belt; if it doesn't, then either the rise of the kilt is incorrect or the length of the waistcoat is incorrect, or both are incorrect. The only thing worse than wearing a belt with a waistcoat is seeing a bit of shirt in the gap between the the top of the kilt and the bottom of the waistcoat. A belt merely accentuates this problem.

If one is not wearing a waistcoat then a belt functions merely as an unnecessary fashion accessory, rather like the fake spur straps on cheap cowboy boots.
Excellently put. The only ways I wear a belt are (1) Over my doublet when piping, (2) With a "casual" low rise kilt, when its warm enough to be wearing only a shirt on top...