Bored of wearing the same shirt-over-white-tee combo every day? Here are three cool—and simple!—shirt-related styling tricks from the men’s runway shows.

All the basics at once, please. Take your jeans and a tee to the next level with a crisp, white, not-so-buttoned button-up and a boxy blazer. Shirt? What's that? Ditching your first layer takes an ...