(And everything else I wear are yoga pants and leggings. But the yoga pants ARE really loose in the waist so...........I dunno. I just don't buy clothes like, EVER if I can help it.)
Sooooo, I recommend the following retailers:
Pennington's & Addition Elle -- same company, shipping out of Canada. Their prices look pretty steep on the web, but remember that you're converting CAD to USD if you're in the US. The shipping sucks ($12.95 CAD) and the return policy is a pain for international customers, so I'd recommend buying just basics that they make in many colors/patterns for your first order, so you can figure out your size. I highly recommend their In Every Story slim fit/ankle pants. They fit as well as the pixie pants at Old Navy do, are actually cheaper after conversion rates (really!), and despite chub rub, have not pilled nearly as badly in the thighs as most of my pants. If you watch for a sale, you can legit get them for as little as $17. Bonus? I have 4 pairs; three have fully functional pockets.
ModCloth -- They were unfortunately bought out by Jet.com, which is owned by Wal-Mart, and specialize in quirky to such a degree it can spill from cute straight over into "What the actual fuck?", but they have a really liberal return policy and will even give you an extra $5 if you accept store credit instead of a refund. I like the Charter School sweaters, but size up if you're plus size. They ran small, then changed manufacturers so they run true to size, but also shrink more in the dryer. Size up.
Talbots Woman -- Insanely pricey, but they regularly have 30% off or 40% off sales, and reliably have discount gift cards on Gift Card Granny. That post I made about getting $600 of stuff for less than $300? All Talbots. I like their Pima cotton tees, which have not faded despite lots of washing, and -- again, combining sales and coupons -- their Audrey cashmere sweater. I think I got mine for $70 down from $169, which is still a splurge, but not at all unreasonable for cashmere.
DressBarn -- Being my size, I hate shopping at a store with "barn" in the name, but their Westport jeans are $36 and do not leave a giant gap in the waist. Also, no bullshit mini pockets that barely fit lipstick. Also, they have BOGO sweater sales every year.
Macy's -- Again with coupons and gift cards. I recommend the Charter Club brand sweaters (the cashmere drops to, like, $49 on Black Friday) and their black dress pants. Real pockets, $34.99 'everyday value' price, though that sadly means no coupons.
JCPenney -- Yeah, really. That JCPenney. The Worthington line has cute work trousers in about six colors and regular/curvy cuts, and short, average, and tall lengths. The pockets fit my giant keys, y'all. They also have a series of 3/4 sleeve button ups that go up to 4X if you've got, to quote Crazy Ex-Girlfriend, "them heavy boobs" and don't want button gap.
eShakti -- All their dresses and skirts have pockets. Seriously, all of them. All of them. For a $10 upcharge, you can also have something cut to your exact measurements, which is nuts. Watch for 30% sales. I recommend going one size up.
Ann Taylor Loft is apparently also going into plus sizes, but I haven't tried them yet. Old Navy has plus size, but I've never had anything I've bought there hold up, so the low price tag us great until I have to replace those pants three times. ASOS Curve and Eloquii also have some nice stuff, but it's usually buried under more pages of shirts with weird sleeves and dresses with odd ruffles and just general garbage than I have patience to scroll through. YMMV.