What is the origin of the idiom "ride on one's coattails" and when to use it?

The origin of the idiom "ride on one's coattails" can be traced back to the 19th century when coattails were a prominent feature of men's formal attire. Coattails were long flaps at the back of a coat that extended below the waistline. They were primarily decorative and often associated with individuals of higher social status or authority. The phrase metaphorically suggests that someone is riding or clinging onto the coattails of another person, using their position, influence, or success to gain advantages or benefits for themselves. It implies a sense of opportunism and opportunistic behavior, where one person is taking advantage of the accomplishments or reputation of another, rather than achieving success through their own efforts.