As was mentioned, in the period when the belted plaid was worn by "civilian" highlanders (roughly 1550-1750), the setts with white backgrounds were considered women's tartans. Other than that, pretty much anything goes, even solids.
Another consideration: tartans with bright, lively colors - especially red - were achieved with expensive imported dyes. These would be "rich guy's" tartans. Commoners would have more "earth-toned" setts derived from local dyestuff....
Brian
"They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety." ~ Benjamin Franklin
Bookmarks