Tweed really is a fabulous material. The colours give me the most aesthetic pleasure, particularly the often unusual, even daring combinations to be found in your Harris. All natural too. Mind you, texture is also something to relish - ever felt the nap on a piece of Breanish? Sumptuous.
I think people under-rate its practicality and flexibility: a well-cut tweed jacket is perfect for today's business meetings where you want to look smart but retain an element of informality. (By the way, I would make sure to choose a blue- or grey-dominant colour for town.) But it's just as right with jeans down the pub or park.
Moreover, they just refuse to wear out. I've been buying them for twenty years now and I haven't had to throw one out because of old age. In fact the only one that had to be shown the door was a Hugo Boss number in a light-weight maritime blue and green Scottish weave but with unfortunately directional shoulder pads. I have a prized navy, sky blue and tan single-button jacket made for me by Richard Anderson nearly ten years ago, which I can honestly say looks as good (probably better) now than it did when new.
Despite tweed becoming more popular amongst designers in recent years I think we still don't see enough of it. When was the last time you saw a tweed bomber jacket for instance?
As well as all the qualities enumerated above its sourcing makes it the ideal material for our eco-conscious times. It has an authentic, interesting and local provenance as well as environmentally friendly, craft-based and sustainable manufacture. Finally, in buying the Celtic stuff you're often supporting marginalised traditional communities. If it were Italian, French or Spanish I really think we'd rave about it.
What's not to like?