Significance of white in a tartan

[AFS1970]

When I first joined my local St. Andrews society as a teen, there was a gentleman who everyone thought of as the kilt expert. Several people told me to see him about what to wear. Some of his wisdom was about the colors in one's tartan. I can only remember two, both of which turned out to be myths. They were a gold stripe represented loyalty to the (English) crown and a white stripe represented Christianity as opposed to pagan religious affiliation of an entire clan.