2. Casually; with jeans, chinos, a more casual suit (Tweed, Seersucker), odd jackets, sweaters, shorts. It is one of the most casual button front shirts you can get, one step above a polo shirt, or a plaid flannel in terms of formality. Far too many people (Non sartorially inclined people that is) consider them dress shirts, when in fact they are way closer to a casual shirt. It is the most casual shirt you can wear with a suit, and though in the US it is often worn with business suits I feel that there are better choices.