The Ballantyne I wore yesterday is "only" lambswool. I actually greatly prefer it to cashmere in some regards, especially where the fabric is thin. But the Lockie cashmere I got really does feel more durable/solid than many makers. Hopefully it holds up well over time (I think it will).
This is very busy. Having said that I do think it will work - as a deliberately very busy/intense look - if it's a suit rather than a jacket. If paired with a regular pair of solid trousers, it will look disproportionately too busy in the top half compared to the bottom, and I suspect that pairing it with differently patterned trousers will simply look kaleidoscopic. But as a suit, it may just work. It's quite different from your usual style however (closer to something I occasionally try - operative word is try! - to pull off with that busy strongly-checked DB suit I have).
Is the suit a worsted or a flannel? It looks to have some nice texture?
I do agree with whoever upthread mentioned that the bow tie looks a bit too wide for you. If it were floppy, I think this could still work, but it's just a bit too rigid/neat for that here. I have the same problem with many bow tie makers, as I think you've noticed in some of my pics before.
I like the suit/shirt/tie combination. What I would say is that those elements all stand out boldly against each other (in a harmonious way) whereas - as you yourself mentioned - the handkerchief is a more tonal/blended element. Either missing it out altogether, or opting for an equally contrasting colour would would work better I think. It could be matching (ie white linen as a default option), or a complementary (eg something with some yellow and/or browns in it, maybe?). Obviously the latter would be the harder choice, as finding exactly the right complementary colours in the right intensity would be a matter of trial & error and is also dependent on what is actually available in your collection.