As a B, I love Naomi cosplayers!
Definitely go with regular blue denim for the jeans. And the jacket should be mostly leather (or faux leather,) with fabric in certain places.
The boots are black leather, come to just under her knees, and have a moderate heel. Here's
what they look like from the back, although it's not the greatest reference. I don't think they have zippers or laces or anything.