I personally play with reds and browns. I do "get" that bright colors are completely fine I personally prefer the muted colors because, well, I'm not going for any sort of historical accuracy. I generally do the whole thift store run for the base of the outfit and then add/create details as I find them at other shows/cons.
I enjoy the idea of having to explain off the medals I have or any other details if asked. If you want to use neon. . .it's doable. I mean I used glowsticks in a water gun to give a gun a more "Mad Science" sort of look. so maybe that could work for you?