Aerie has some nice cotton ones that I don't find to be sheer at all. I've had them about a year and they've held up great.
For fleece lined ones, I got this pack off amazon a few years ago and they've been great. A few of my more worn pairs are just starting to pill a bit, but that's an easy fix.
These cheapo leggings from Amazon have gotten me through 2 pregnancies over 5 years, and at $6/pair the price is right to get a bunch of colors: Great cheap leggings.
When I get huge toward the end, I use a Bella band to keep them up, but that's true of nearly all maternity clothes for me.
These leggings I ordered off of Amazon have been my jam from week 8 to 37 and counting. Not maternity, but they're essentially socially acceptable sweatpants with an extra wide and stretchy waistband.
As I've gotten bigger I pair them with a Bella band so they don't slide down too far, but at $5 each these have been my best maternity clothing investment.
I ordered these regular non-maternity fleece-lined leggings on Amazon for $5 a pop in a six pack. At 18 weeks with a significant bump, I've got lots of room to grow, and they have a wide waistband that keeps them from cutting in. Have literally worn nothing else for two months now.
I've been wearing these fleece-lined leggings for a few weeks now. Not sure that they'll last forever, but hard to beat $5 a pop, and super comfortable with an extra wide and stretchy waistband.
Just bought a six pack of fleece lined leggings - have literally worn nothing else since they got here.
I'm trying to figure out more things to wear on top that are work appropriate, but since I've been out of pants I can wear for a few weeks now, these are AMAZING!
I bought a six pack of fleece lined leggings on Amazon for $30. They're not maternity leggings but damn they're so comfy!
I recently got these on Amazon. They're fleece-lined, so warm, not see through and affordable if you're into simple.
My biggest cheap maternity clothes wins so far have come on Amazon.
Fleece-lined tights (basically socially-acceptable sweatpants), 6 for $30. Not maternity-specific, but I'm 25 weeks and still have plenty of room to grow in these. Have literally just rotated through these every day for the last 4 months. Tights link.
Nursing bras, 3 for $30. Got this pro tip from a girlfriend, you'll probably need nursing bras anyway and they're comfy and stretchy enough for maternity boobs. No more underwires near these titties! Nursing bras.
The sausage feels are real! I bought these leggings from Amazon to try to eek out my time. The relaxin is really working on my body. https://www.amazon.com/gp/product/B00X6CYBGI/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ALDOIYGSIR99N
I love leggings so much. You can get several pairs in a set on Amazon. They're fleece-lined and <em>extremely</em> comfy.
Amazon! I'm on the smaller end of plus size and these work for me. These look like a decent buy too, and are labeled as plus-size.
Thumbs up to the people recommending Wal-mart too though, because I'm not sure if Amazon.ca has the same leggings selection as the US site and I'm gonna need more 'cuz it's supposed to get coooold here.