Single-breasted

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.

However, from the 1930s onwards, peaked lapels on a single button jacket have been variably[1][2] in fashion.

[3] Historically, the single-breasted jacket was worn by the ground troops:[4] it was easier to mount a horse with the fronts spreading out to the sides.

[6] Due to several layers of fabric in the belly area, models with two rows of buttons can be very plump.