Pair it unbuttoned over a white crewneck t-shirt with slim-fit dark denim jeans and clean white sneakers.Smart Casual: Button it up completely, tuck it into beige or khaki chinos, and finish the look with brown leather loafers or desert boots.Layered Look: Wear it under a neutral-colored crewneck sweater or denim jacket, letting the plaid collar and cuffs peek out for added texture.