This question could potentially fit into several forum categories so I am posting here for max. exposure.

What are the general guidelines that our kiltmakers consider when deciding if a given tartan should be pleated to the sett or a stripe?

I realize that what one person likes, another will not but there has to be something to look for: size of sett, dominant horizontal or vertical lines, certain colors, etc.
(If you need a tartan for illustration purposes, I am planning on a kilt in the Keith tartan )