Midnight twill and a true white shirt is about as clean as business casual gets — the deep, near-black navy grounds the outfit while the white keeps it from reading too serious. The twill has a slight stretch and a soft brushed hand that moves well through a full day at a desk or in meetings. This is the pant you reach for when you want to look sharp without wearing anything that reads as a suit.

Finish with brown leather derbies and a matching belt.