Target and Old Navy both have good, inexpensive lines of fitness clothing that run into plus sizes, so those would likely be good places to start to look for things.
If snow is common where you are (meaning there's snow on the ground for most of the winter, and the 9 inches you mentioned isn't just a one-off or the result of a particularly bad blizzard or something) you probably want to invest in waterproof hiking shoes - they'll have the support and traction you'll need to deal with snowy terrain, and even though they're technically labelled for hiking, they'll be fine for walking as well. You could also look into getting a pair of walking sneakers (they're usually labelled as such at the store, and you can find them wherever sneakers are sold, from various companies), but I'd be concerned that regular walking shoes aren't tough enough to navigate snow.
As for clothing, I run outside, and I usually wear a pair of running tights (they keep my legs warm and also wick moisture, meaning they keep me from sweating), then I wear either capris or loose fitting yoga or sweatpants over the tights (capris when it's warm, yoga pants when it's in-between, and sweatpants when it's straight-up cold). On top, I dress in layers - usually a tank top that wicks moisture, a t-shirt over it, a fleece or long-sleeve athletic shirt over that, and, if it's really cold, a zip-up vest over everything.
I also ALWAYS wear a hat and gloves - I find that as long as my head and hands are warm, the rest of my body is able to tolerate the cold better.
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