re: What brand of casual pants are y’all wearing?

For the dress code you described, check out Lands End. They have nice cotton polos, but a little bit on the pricier end for what they are. The Lakewash chinos are a great deal though at $50. Lots of fit options, small but good color selection, and pretty good quality. The additional milage you'd get out of them is probably worth the extra money compared to what you'd spend on some of the cheaper options out there.