I didn't think I really *needed* maternity underwear but I'm so glad I bought them!  I did not get the lace ones (some pics of reviews showed several strands) and got the regular band ones instead.  They are perfect.  I don't really have any bottom so a lot of underwear rides up.  These underwear stay put and they are so comfortable way below the band.  Most of my underwear is stretchy but there were some pairs that ended up itching at the top panty line. I'm on here buying the 5 pack now!  I ended up getting a large.  I usually would wear a medium but didn't want to go smaller since I'm 20 week. The large was perfect.  I'm usually a size 6 pants if that helps.