Haven't got any pics just yet! will get some next time I can get my mate to get a pic! In the meantime, it's an olive green woolen ruana style cloak. It's about knee length plus a little and has a loose fitting hood. It's amazingly warm. It's basically a wearable blanket!
There's no modern standard here. Cloaks are unusual, especially on men. Which is not to say you shouldn't do it, but that you should understand that you're in uncharted territory, developing an aesthetic that will be entirely your own. If that's sweatpants, tights, pleated cords, orange denim... you're on your own here.
Idk. Try corduroy and tweed. That could give a rustic effect.
I hadn't considered making one, but I'll keep it in mind. I certainly don't have the mental bandwidth at the moment, but I imagine it's much cheaper than buying one.