Of the four Girls, Marnie Michaels circa season one, had my favorite style. On top of that? Her hair was total pageant-worthy. (That is a good thing in my book.) I hate that a Google Image search for Marnie Michaels does not yield the full length outfits that I was hoping to uncover.
I think her style signature, at least in the first few seasons, was dresses with architectural necklines. See the following exhibits: