QOTD: Since most of us are experiencing at least some colder weather I thought we could discuss running clothes for the winter today. What items you find work well and others that don't?
ATTQOTD: 

So, um, we've had forecasts for record-setting heat here the past week+.

But I believe it
will cool down eventually, so I'll play along! Caveat: "cold" = temps below 50 here in west-central FL, but has been known to get into wind chills in the teens-twenties.
After the frigid temps of WDW Marathon weekend this January, I got some Serious Winter Running Gear and was very glad I did when, a few weeks later, it got just as cold again. My favorite items were:
Toasty Tights from Skirt Sports: the tights are thick all over, but also have flannel panels across the rear and quads and made cold, windy nighttime runs sooo much more comfortable!
Wonder Wool jacket from Skirt Sports: Wool has long been my go-to for winter warmth (I grew up in WNY), but this was my first non-sock wool running item - it's amazing! Kept me warm without making me sweat like polyester fleece does. So lightweight, too, and breathable.
I wear SmartWool socks year-round: they keep my feet comfortable in almost any temp (I have Raynaud's Syndrome and do need to use heat packs in my shoes while waiting for cold races to start. They stayed in my shoes until mile 5 of teh half this year, and I never took them out in the 5K or 10K lol!)
I bought a couple new winter beanie-type hats from Target. They're not running-specific, but if it's so cold I need a knit hat, it's too cold for me to even begin to sweat.
I have a few Buffs that I love to use as neck gaitors/ear covers.
My usual cheap, knit gloves weren't enough and I found myself wishing I had mittens, so I got a pair of those.
I have a stockpile of Mylar blankets and heat packs for fingers and toes, too. Laugh all you want at the Silly Floridian, but I moved to FL 25+ years ago because I was sick of being cold all the time!