Have you met the legendary outlaw Starlord? The leader of the team in Guardians of the Galaxy (well, he’s mostly the leader) has an easy to spot mask and coat, and cosplayer Vancouver Starlord nails it. He acquired the helmet from SoloRoboto — they make cosplay props and replicas. Vancouver Starlord then combined the pre-made helmet with a modified jacket. He purchased a jacket online and put time into alterations:
we got a not-movie accurate jacket from a seller and then spent about a month and a half (not solid hours, we both work and I also have university) getting the jacket fitted and tailored to a better fit and shape and then sewing the surface detailing by hand, painting and adding leather to places that were necessary and creating the shoulder plates. If you want just the base jacket there’s a lot of different styles all over the place.
You can see a couple of pictures below and more on Facebook. I find the ensemble to be an excellent example of combining the ready-made with crafting techniques.