Celtic Frost Battle Jacket

My first battle jacket! I'm going for a doom/stoner/classic hardcore punk theme, with a few patches of other bands I'm into. The back and sides are a work in progress, as I'm waiting for a couple more patches to come in (as well as patches picked up at future shows,) but it's finally to a point that I can start wearing it. I'm quite proud of it, especially considering it's my first major sewing project. Note that I converted the standard collar into a mandarin style. My only gripe is that it looks too clean... any ideas on how I can dirty it up, without ruining the patches or making it stink? Please let me know what you think!