"To wear a suit" means to dress formally in a coat, matching trousers or skirt, and a dress shirt for special occasions or professional purposes. Full definition
Perfect under suits in my business casual office where most do not wear suits at all. (corporette.com)
Skip the dress this year and stay warm by wearing a suit in your favorite holiday color and coordinate with textured accessories. (lilmissjbstyle.com)
If your host has requested that you dress smartly — often known as cocktail attire — then they will be expecting you to wear a suit of sorts. (theidleman.com)