Reading so many posts about Trench coats has got me thinking, hmmm, maybe.

I have a black trench probably about 15-20 years old, but has the style changed at all? It seems fine, but the maybe is coming in because it doesn't have a hood, and if its raining but my hands are full, a hood would be a nice option. If I bought a new one I would probably want a non-traditional color...like purple! I could go black again, but doubt I want the traditional tan.

So, all the posts about Trench shopping, Trench buying, have been analyzing the subject in depth and detail! Can any Trench experts tell me what to look for, what makes a great one, what are the details I should want...and whether purple is even going to be possible to find?