What to wear running in the dark?

well you can buy reflective belts that work for all teh time i wear mine when i go running just to be more visable

I used to live out in the middle of nowhere, and it was pitch black. I didn't run. I didn't even go for walks. But that is purely due to the neighbor's German Shepard that would run and chase you down the road!! Ahh the country.
I would make sure to wear gear that has a lot of reflectors on it, you need to be seen by motorists. Also, take a flashlight with you and a cell phone just in case. Fanny pack it.
Good luck!!

Headlamp and reflective gear.

Underneath, same thing as I would wear if it was cold & bright. Running (or compression) tights/capris, loose shorts/tracksuit bottoms, long-sleeve compression top, hoodie/jacket, and a good pair of running shoes.

I never wear a hat, it's a good way to lose excess heat when you're running.

Headtorch and a Hi Viz bib (cost me £3)

Great suggestions...I'd just add one thing...if you tend to have close calls on the road, I wouldn't run at all on it. It'd be better to drive to a school/gym & run the track, or to a well lit suburb or road w/sidewalks. We live sort of in the country & I see people walking, running, and/or biking on a road that's a single (fairly narrow) lane in each direction, w/deep ditches on the sides of the road. Multiple people have been killed on the road. Some of the athletes sort of have an in-your-face attitude about it, that it's their RIGHT to be on that road. Legally that may be true, but your family won't care about legalities if they lose you. Not long ago I read about a mom who ran on a road like this...she was hit by a car & killed, left behind a husband & 3 young kids.

Wear nothing. Trust me, everyone will notice you.

Here is everything I wear head to toe on runs, with pictures for ya since you asked

Head lamp:

I wear this on every night run, whether on the side walk or on the street. I like to be seen and to see as well, so this is a must for me. This one is nice because it has 3 settings, bright, dim (for if you are in a group or something like that) and flashing.

Reflective or bright shirt.

Notice the brightness of the shirt (NOT BLACK!) and the reflective brand marking that will illuminate when light hits it. Look for those little reflectors when buying clothing to run in.

Reflective water bottle.

Notice again the reflective brand marking and reflective markings on the tightening strap.

Ankle bands.

I sometimes wear these, sometimes not. Depends on where I am running, amount of traffic, etc...

Flashers on each foot.

This is actually another headlamp, but it works as a flasher on my shoe now since I upgraded to the headlamp above.

This is awesome. Has two strobe settings and one steady setting.

RoadID.

But I have that on all the time day or night. Tip, if you don't want to spend that much on this, go to the pet store and get a dog tag and put your info on it and then attach to your shoe.

ETA:

The local running store here had a Brooks reflective gear night with a rep that came and talked about being seen on the roads. He made some very good points to always have two different colors of flashing or steady lights and to have reflection on moving parts because the human eye is drawn to movement easier than to steady streams. Made sense to me so passing it on.

I use a reflective vest & clip my rear bike light onto the back of the vest. My laces are also reflective & of course my phone strapped on my arm. My daughter also just made me a glow in the dark hair clip