Instead, think layering. You really don't lose that much heat off your legs, so typically you can get away with about one-third the insulation that's comfortable over your upper body. For snowshoeing when temps are in the upper teens to upper 20s, for instance, I'm usually fine with a midweight long underwear layer (for you, try the women's Midweight Bottoms from Marmot: $40; www.marmot.com) with a windproof or waterproof-breathable layer over that. A pair of decent Gore-Tex pants, or something similar, would work fineperhaps REI's Switchback Pants for women ($160; www.rei.com), which use a proprietary waterproof-breathable fabric to make an affordable all-weather pant.
Depending on conditions, you can add or remove underlayers, too. Some days a pair of light long underwear will be all you need. Others, the so-called "expedition-weight" stuff, will be trimmer than those puffy pants you're using now.
Of course, da bomb for winter activities is a pair of Gore-Tex XCR bibs. Bibs are warmer than waterproof-breathable pants because they add a layer around your lower torso. Plus the shoulder straps help keep everything in place. A great bib for winter sports is the Arc'Teryx Minuteman Bib, available in women's sizes (I guess that makes it the Minutewoman). Price is pretty steep at $350, but they'll last for years and give you excellent performance (www.arcteryx.com).
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