For the Snow White dress, I used Simplicity 5832, which also includes an Ariel-inspired dress and the classic Disney Cinderella dress.
I remember that when I made this particular costume, it was the first time I got to work with fusible web, which was required for the red appliqués on the puff sleeves. I also had to use heavyweight interfacing to get the collar to be able to stand up.
As always, the best part was being able to see Kayla wear the costume as I accompanied her trick or treating.
More Halloween Flashbacks:
Halloween 2004 Flashback
Halloween 2006 Flashback
Halloween 2011 Flashback