These things are the cats meow! Long gone are the days of Yak-Tracks (aptly named because their construction makes us yak!). Micro-spikes are the industry leading brand of crampon/traction equipment. The stretchy rubber lets you slip them on and off your shoe with ease, they stay on, they're durable, they work great.
If you think they might be overkill, I suggest you leave one pair of shoes aside for the season and place tiny screws into the shoes soles. The screws should afford you with ideal traction on those lightly icy days.
While I'm a HUGE fan and advocate of Dirty Girl Gaiters, the nylon construction of those shoes isn't really ideal for snowy winter travel. Instead, I suggest shopping around for a durable pair of gaiters (La Sportiva, Mountain Hardwear or OR) designed to keep more then grit out. Anything with a Gore-tex type fabric will work. No more than ankle gaiters will do you fine. While we're at it, Gore-Tex shoes are ideal in the winter. While your feet are still very likely to BE WET EVEN WITH GORE-TEX, the fabric is designed to keep you warm.
Fleece Lined Tights:
Yeah, you know they're sexy. Just slide your legs into these babies and never feel the cold again. Just be sure you buy the right pair. Just like when buying a fleece jacket, fleece lined tights come in different grades. Some will keep you warm down to 40 degrees (who the hell is wearing these at a paltry 40 degrees?!) and others will keep you warm to damn near zero. it really comes down to your local climate and what temps you'll typically see. This will be your BEST investment of all the gear you're likely to buy for the winter. Don't be afraid to spend! one pair of these will push you through 2 seasons at least. Just do us all favor and wear a pair of shorts over "The Bulge"!
The rest of the gear that you'll need is entirely up to you. When it comes to the top portion of my body, I tend to wear all those race shirts I received over the years, and never wear otherwise, during the winter months. They're light weight and wicking. I typically wear a short sleeve tech shirt, then a long sleeve tech shirt with another "baggier" long sleeve tech shirt over top. I also have various light jackets I can wear instead of, or in addition to, the 2nd long sleeve shirt.
90% of your body heat is lost through your head. HeadSweats makes quite a few, amazing, winter hats. Some are fleece lined while others are a lighter weight wicking fabric. The key is to wear something to keep your heat in while not causing you to sweat profusely. Laos consider buying a runners mask which covers your head, ears, neck and up to your nose if you'd like. Under Armour makes a stellar one. Gloves should be just enough to keep your hands warm and not so hot that you'll sweat a lot. See a trend? Comfort, warmth without sweating a lot.
Now get out there! NO EXCUSES!