Hadn't considered cords; you don't think the top block is too conservative/formal for cords? But I do think the color of these flannels requires more pop on top. I didn't consider just how close they were to khaki when I picked the swatch. I recently had the pants lengthened a bit, which even though added more break it also made them appear less tapered. Still not 100% ecstatic on the fit, and having a higher rise (my first try at that) with the flat front in this color seems like a vast landscape of fabric up there, but they're better than they started!
I think the top block is pretty 'country-casual' given the nature of the jacket cloth and tie. the only thing conservative are the colors and the shirt material. Cords, cut like a dress trouser, are very acceptable and would like nice with your outfit. Perhaps olive or navy or aubergine or any number of other possibilities.
People have this odd aversion to pleats because they don't understand them and think that they just make people look fat and that they are old-school.
Pleats can be extremely flattering on anyone if the trousers are cut well...and look especially great on trousers with a high-rise. I would recommend trying a double pleat on your next pair of trousers. Single is acceptable...but double is much preferred.