Well, I talked about it for a bit, and it's finished now. I wanted to add some additional color to my otherwise all-black motorcycle jacket but wanted a theme to base it off of that would be within the scope of my rather limited artistic ability. I went for a Mass Effect N7 armor theme.
For those other gaming nerds, the stripe is on the "wrong" sleeve. I did this on purpose because my left arm will be a lot more visible to motorists and if I use it for hand signals and such. This is meant to be a fully functional motorcycle jacket, albeit with a gaming theme, and not a piece of cosplay.
Here is my final result:
The color is all Jacquard NeOpacque acrylic paints which are high quality and supposed to be good for textile surfaces.
The white elements have all been reflectivised with retro-reflective glass beads. This was the hardest part of the process and I'm not sure how well they will actually be in the long run. I applied them by sprinkling them on top of the last layer of paint while it was still wet. This worked better on the back than the sleeve partly because I figured out what I was doing a bit better and laid the paint on thicker, and partly because the surface of the back panel is different. The white is just opaque gloss because the glass beads give a frosty-looking finish to the surface they are applied to. On the white it just makes it look raised and texturized, but it makes the red look funny.
The two surfaces on the jacket each presented their own problems. The sleeve was really really slick. To mask down the stripes I used tape. Blue painters tape wouldn't stick. Black electrical tape wouldn't stick. I had to use duct tape, and even that didn't stay on well. The back is a tight mesh. This was fairly easy to apply paint to, but it soaked all the way through the jacket. I suspected this might be the case, so took out all the liners and armor pads.
We will see what sort of longevity this paint is. I suspect the reflective beads will slowly rub off. I may need to apply some sort of clear coat over the top if I want to seal them in. That will remain to be seen though.