The other thing is, if your waistbands are too tight, go online and just order bigger underwear. You don't need to wear anything close to the same size.
My husband brought me materity underwear on ebay.
I liked boy-leg underwear when I was pregnant. I just pushed them down in front, so they didn't have to come up over any of my stomach. They do make maternity underwear, but I usually work bikinis and the big tummy on maternity underpants was weird to me.
I think they did exist but I'm going to target today cause I'm almost due and I know I'm gonna need bigger/more comfortable underwear. Just go to Walmart of target and get cotton underwear. Fancy panties are out the door by the time you have the baby. You can get back to the sexy thongs once baby is out and you're healed! Lol. At least that's my plan. I've been wearing boy shorts and what not this whole pregnancy.