Quote Originally Posted by AFS1970 View Post
For those that have designed a tartan, is it ever OK to base a tartan on another tartan?
It happens all the time!

Sometimes the changes are subtle, so that the original tartan and the new variant are tricky to tell apart.

Examples are the California tartan and the West Virginia tartan.

Some tartans are favourites for this sort of treatment, the champions probably being Royal Stewart and Black Watch, both of which had variations done to them as far back as the 18th century.

For example when the Gordon Highlanders were raised they took Black Watch and added one yellow line to match the yellow facings of their red jackets.

There are dozens of variants on Royal Stewart, with black, blue, tan, grey, etc backgrounds.