I bought these and initially loved how it let me wear my existing clothes.  I wore them to work under my suit which worked great.  But they hug your belly so that the material can hide the unzipped/unbuttoned pants, and I felt too uncomfortable, and the tightness made me feel nauseous even though I was past the nauseous stage of my pregnancy. So I gave up and went to low-riding maternity pants instead to get some belly freedom.  Also, they would ride up when I used them for my jeans.  So I can imagine if I got a bigger size for a looser fit, they would ride up and end up showing the unzipped/unbuttoned pants.