short (cropped) fitted jackets are sometimes called bolero's too. but i would call a denim jacket a bolero.

i called it a denim jacket. (and unless it was styled differently (a duster, or tailored (suit like)) i would expect a "denim jacket" to be the most common sort, (snap front, long sleeved upper chest pockets (coming out of a shoulder yoke) somewhat fitted, some what cropped.