If you're talking 0c then really any normal running gear should be good still. Some of those stretchy calf length pants work relatively well. It might be a bit brisk to start off but if I've learned one thing after a few frozen runs it's dress for the finish not the start. It gets really obnoxious to have a bulky coat on half way through, particularly when there's no need to wait around at the start where it might keep you warm.

One thing to keep in mind is that when you start your running, you might be a bit cold, but you'll warm up fast. So dress for the end of the run, the warm-down walk.

A water wicking under layer will keep you pretty toasty. Get yourself some marino wool socks too. You want your feet dry and warm.

Ski underwear and socks made from wool / merino / synthetic, and top layer wind resisting running set. Plus something to keep hands and head warm. If too cold add additional layers of t-shirts in beetween. For night runs a headlight is a life saver.

I've liked my thermal tights from 2XU. Had them since 2014, and used in negative Cs (maybe down to -5C?). Feels very chilly when you first go out, but then gets quite comfortable once you get running.

I can't run outside myself until Spring now myself - suffering from runner's knee now and slowly recovering, but it can still start hurting in the middle of a run. Having to stop to walk back in the middle of a run is not ideal when it's cold outside and you are dressed for running and not walking.

I am not shure if it's professional attire, but I work well with Thermoleggings worn under my short trousers. They normally dry pretty fast. Also essential: One buff for the neck, one for ears. Maybe you could get a functional Softshell Jacket? I like the ones with a lot of zippers for additional Air If needed

Mittens are often warmer than gloves, if you don't need your fingers. A headband will let excess heat dissipate, whereas a hat will keep it in.