Waistcoat length

[Drwill4]

Have a question about the length of a waistcoat. Still very new here and am not familiar with the more traditional way of wearing kilts. Most of my time is spent wearing t-shirts and my kilt at or around my jeans waist.

Now however with the weather getting cooler I'm looking at sweaters and vests/waistcoats. Are waistcoat lengths cut specifically for kilts? I assume the biggest concern is to ensure there is no shirt showing between the kilt top and the bottom of the waistcoat. Is that the only concern or can it also be too long like when wearing a normal suitcoat with a kilt?

Don