My sister/MOH is trying to get pregnant. She said something recently about possibly needing a maternity dress. I was going to have everyone get satin dresses from Avery Austin, but now I don't know what to do because they don't have maternity dresses in satin. Part of the problem is because I don't understand how she can buy a dress in advance if she's pregnant or doesn't know if she will be. Should she buy a dress off the rack a month before? I'm very confused and any guidance would be helpful.