Which dress for (my) baby shower?

I am having a girl. Never had a baby shower for my prior pregnancies. This is my last one and family/friends keep mentioning I should have one while pregnant, to do things different for my last. At first I was not into the idea of it all but now I am happily planning with the help of my sister, mother and mother-in-law. I cannot seem to choose a dress. I like all of these but do need to choose one as I do not want to buy all the dresses. Just want to buy the one dress, out of these, that is prettiest.