What is a "single-breasted jacket"?

A single-breasted jacket is a type of formal or semi-formal jacket that has a single row of buttons down the front and typically a notch or peak lapel. They are made from a variety of suit fabrics and can have one, two, or three buttons, and may feature flap pockets, welt pockets, and a center or side vent. Single-breasted jackets are a versatile wardrobe staple that can be dressed up or down and paired with a variety of clothing items to create a range of different looks for different occasions.