What is a peacoat and why is it called a peacoat?

A peacoat is a type of outer coat traditionally worn by sailors. It is characterized by its heavy wool construction, double-breasted front, broad lapels, and large buttons. The term "peacoat" comes from the Dutch word "pijjekker," where "pij" refers to the coarse wool fabric used. Its design has remained largely unchanged due to its functionality and timeless style.