I bought some sleek new running pants! I ended up choosing the Under Armour capri-length leggings. I had some yoga-esque gym pants that I was wearing, but I can't stand how the flared end flaps around when I'm running. It's just so much better with all of my clothing in one place...
I'm still shopping around for a nice, warm running top. I've just been running in hoodies when it's been chilly but they are heavy and don't exactly keep you warm once you start sweating.
New running motto: cotton is evil.