I thought it would be a good idea to share with you some of my inspirations. Here is Hiroshi Tanabe, one of most famous fashion illustrators working today. His design is very simple and graphic using a basic colour as a background and thin lines, emulating traditional woodcuts. Japanese origins, he studied at Accademia di Belle Arti di Brera in Milan (the world is smaller than you thought) and focused on illustration while in Italy.
Here is a graphic collage I made of his works.