A single-breasted garment is a coat, jacket, vest, or similar item having one column of buttons and a narrow overlap of fabric. In contrast, a double-breasted coat has a wider overlap and two parallel rows of buttons. Single-breasted suit jackets and blazers typically have two or three buttons, and a notch lapel.

What is double-breasted and single-breasted suit?

A double-breasted garment is a coat, jacket, or vest with wide, overlapping front flaps which has on its front two symmetrical columns of buttons; by contrast, a single-breasted item has a narrow overlap and only one column of buttons.

Why is it called double-breasted?

WHERE IT ALL BEGAN: FRIVOLITY. When we first started tailoring suits in the latter half of the 1800s, double-breasted suits were the casual offering compared to formal tails. Taking inspiration from the naval reefer jacket (a style like today's pea coats), they were mostly worn for leisure and sports.