The whole problem with reflective stuff is that the light source has to be reasonably bright AND coming from nearly the same direction as the viewer's eyes.

Since low-beam headlights aren't supposed to blind anyone coming in the opposite direction, they also don't throw much light on reflectors that are coming in the opposite direction. (in most situations.)

For that reason, I think it would be great to have a sleeveless mesh vest (not hot in the summer) which was actively lit by LEDs at the edges. It would make you look like a floating torso at night, which would give people some depth perception and size perception when seeing you at night.

I have never yet washed my vest, which is made of orange mesh and reflective strips. I'm not sure it would work well. But I would be impressed if somebody came up with a machine-washable, LED-lit vest. Even if it weren't machine washable, I think it would be useful.

But I'll stick with blinkies and a reflectorized vest unless an LED vest is about $30 US, or less.