I was looking for a slip that would help smooth my post-(second) baby stomach for a bridesmaid dress.  I didn't want to spend a huge amount of money.  I think this is fine and a decent option for someone who wants a little smoothing, but not to have to buy spanx.  I think I should have ordered a smaller size - it didn't seem to do enough to make it worth wearing.  It has a small section that clips open that would enable wearing without underwear.  I think order your regular size and it should work well.