I purchased a Glengarry a while back, and I have a few questions about the conventions of wearing it.

First, is there any rule about highland vs. lowland style of wear or symbolism? I've heard that checking means highland, or that loose ribbons mean lowland, or that tied ribbons mean highland, etc. The sources of these tidbits have each spoken with authority, but I'm not sure if they actually knew what they were talking about.

Second, assuming a plain black Glengarry, is there any rule or convention against wearing it non-kilted? I have to confess the hat (plain black, with a Douglas badge) has become a beloved favorite, and I've worn it regularly to work. I think it goes well with my black woolen overcoat.