I acknowledge I'm not the majority view. Theres a lot of dress shoes worn with jeans around this town. (but then theres also people who wear ties with jeans, cutaway collars, cufflinks - not to mention the old orphan suit jackets)
I've got 3 pairs of leather boots I wear with suits. Well one pair is really ankle boot/chukkas I suppose. I doubt anyone ever notices they are boots until I put my feet on the board room table.
I have, knowingly, done all or nearly all of those. I think if you choose the items correctly, dark jeans, soft shoulder jacket, suede shoes, casual (wool/knitted/raw silk) tie, knotted links it can work.
I think that was my exact outfit at the Kimber launch :-) So, obviously, I agree. With the right pieces I believe it works, to me it's about the level of formality being consistent more than anything else.