This is a great thread--thanks, Spoo! I love Harris Tweed in all of its incarnations, but especially the more striking and rare designs, like the tweed of this canvassed 3/2 sack that's currently in my possession:

(and since this jacket is, er, available to leave my possession if anyone would like it, to make this post far less self-serving I'll be happy to give a
very decent discount on it to anyone who comes to it from this thread!)
Not Harris, but a rather softer tweed suit from H. Freeman, that's just left my possession:

(The pictures don't show this, but the tweed is flecked very, very slightly with moss-green.)
And in case anyone's interested, here's a link to a short article I guest-wrote for the 'blog "After the Denim" on the 1950s/1960s dispute concerning what exactly Harris Tweed is:
http://after-the-denim.blogspot.com/2011/09/when-harris-tweed-isnt-by-james-taylor.html