What does your LO wear under a bottomless sleepsack?

Tarastar33

So, I got a bunch of sleep sacks as gifts, but not the zipper ones, the ones that are like a onesie, but open at the bottom. So almost like a long dress with elastic at the bottom. When so they wear these!? Seem impractical to sleep in because it would ride up. Are you suppose to put some sort of sleep pants on with them?

Am I just a stupid first time mom??