The Dinner Dress
As its names hints, it is the dress Rose wears during the dinner scene and, after that, during the party in third class. There is also a cut scene (Shooting Star scene) in which she wore it.
There was a white version made for the heaven scene.
This dress is nothing but uneasy to do: there are pearls spread all over the dress and many other things...There is a long train on the right side (which is the thing Rose asks Jack to hold when she rises on her toes)...
I really love this dress...Below are some of the pictures I found and on which you may see it pretty well.