A vent is a slit in the bottom rear (the "tail") of the jacket. Originally, vents were a sporting option, designed to make riding easier, so are traditional on hacking jackets, formal coats such as a morning coat, and, for reasons of pragmatism, overcoats. Today there are three styles of vent: the single-vented style (with one vent, either directly at the center or roughly 3 cm to the right); the ventless style; and the double-vented style (one vent on each side). Vents are convenient, particularly when using a pocket or sitting down, to improve the hang of the jacket,  so are now used on most jackets. Single vents jackets are associated with Italian tailoring, while the double-vented style is typically British. (This is not the case with all types of jackets. For instance, dinner jackets traditionally take no vents.)
- Bookster, a manufacturer of tweed jackets, has illustrations of various features of jackets: "Jacket options". Retrieved 2008-09-20.
- Antongiavanni (2006). p. 172