Ask the MB: What to Wear With Blue Seersucker Pants
A: T.R., the pants and the shoes aren't having an argument, but they're definitely carrying on a rather loud conversation. In this case the role of the shirt is to observe, quietly. Wear a simple white sport shirt with this outfit, like this slim-fit Theory option. The fabric's subtle lustre offers the desired texture contrast to the puckery seersucker and nappy suede.
A couple of other strong suggestions while you're on the line:
1. One way to make seersucker less Gregory Peck and more 21st century MB is to remove the crease. Assuming they're flat front (and they really need to be), simply staple a "no crease" note to a belt loop for the cleaner.
2. Definitely show some ankle and wear these no-show loafer socks.