dress corduroy pants
I wear my Lands End cords to work where we are business casual (wool slacks, no tie, sport coat, etc.) and they are fine.
I personally wouldn't do cords slacks and a cord jacket - just my personal opinion. However, the sales person at my local menswear / shoe store is much more fashion forward than I am and he has a cord suit. It looks great on him as he's tall, thin, and mid 30's. So you may be able to do the cord slacks / cord jacket look.
I wouldn't wear cords with a cord sportcoat - wear something else with some kind of texture like tweed or a loose weave wool.
I've seen cord suits looking pretty great but I'm not too sure about how separates would look - being able to play around with different textures is probably my favourite thing with fall/winter dressing. Though I suppose differing whale counts is a different texture but you could end up looking a little 'fluffy'.