A small-scale check is the safest pattern to wear to work because it reads as texture from a normal conversational distance, not as a statement — charcoal underneath keeps it grounded instead of busy. The shirt's stretch means the pattern doesn't pull or distort across the shoulders when you're leaning over a desk. This is the outfit for the office that allows a little personality but not much, the one meeting a week where you'd like to look slightly more interesting than your slide deck. Business casual for men doesn't have to mean solid colors only — one check shirt with a clean pant proves it.
Finish with black leather derbies and a black belt to match the pants, not the shirt.