Given the cost of made-to-order tartan hose, I can fully appreciate why one would be reluctant to wear them as daywear, or perhaps more accurately as daily wear. After wearing tartan hose, I dry clean them rather than washing them in order to preserve size shape and colour, so wearing them about is a not inexpensive proposition.

Aside from the practical consideration, there are lots of photos about with Mat Newsome wearing tartan hose with tweed and frankly it's a very sharp look - check out the photo gallery at New House Highland - http://www.newhousehighland.com/kilt_gallery.html

Would I do it, absolutely, but not often. I wouldn't consider it a highland fashion faux pas.