A denim (jeans) jacket can become your best styling tip in every season and especially in spring & autumn were is cold enough for a single t-shirt !
The perfect combination (in my opinion) is a black leather legging (always my first choice for everything:) ) ! A black skirt (leather or not) is also a good idea. Colors can easily be combined, giving a refreshment tone! Gold or silver accessories can give an alternative rock style! You can never go wrong whether you combine it with a simple white (or a rock) t-shirt or an elegant (simple) dress.
Tip: The advantage of a vintage denim jacket is the color as it is getting better & better over the years!