Boys coat and Jacket

A coat is a long garment worn by both men and women.In the early nineteenth century, coats were divided into under-coats and overcoats. The term under-coat is now archaic but denoted the fact that the word coat could be both the outermost layer for outdoor wear (overcoat) or the coat worn under that (under-coat). However, the term coat has begun to denote just the overcoat rather than the under-coat.
Source: wikipedia