I vote for the black/white/navy combination, but also agree that it might not be a bad idea to get some swatches.
Very neat that you're going to get a custom-made suit tailored just for you!! I read your other thread, and I think that $500 is a really good deal. Not that I've ever done this myself, but a good suit can cost a lot more than $500 and the fact that your local tailor includes two fittings and is willing to let-out and/or take-in seams as needed after the fact? I don't know that you could beat this price, buying a suit off the rack, that then needs to be tailored anyway.
Have you considered having this tailor make you something simpler and less costly first before the suit, so as to get a good idea as to his/her skill level? What do you think of this idea? I know you've already asked for a quote on a suit, but ...how about making you a nice skirt or something first before you dive in on the suit? Just a thought.
In the meantime though, based on the online photos - I'd go for the black/white/navy mix in terms of fabric and colour.
I'm really looking forward to reading about how it all turns out, so please do tell-all when it comes to what this process is like