Place a small amount of frosting on the top part of the dress.
Use your palette knife to smooth this part of the dress, creating a thin "sheer" appearance. You will also want to shape the dress to mimic the dress style the bride is wearing. In my case, I created a "V" cut top.
Squeeze out a lot of frosting onto the skirt part of the dress. I did several rough layers of frosting since the Wilton tip #2 is a small tip.
Use the palette knife to smooth the frosting evenly over the skirt. Then, create folds by pressing into the frosting with the tip of the palette knife and draw a vertical line down from the top of the skirt to the bottom. I held the palette knife perpendicular to the dress in order to do this, but your dress style may be different.
Use the palette knife to connect the skirt thickness to the sheer top thickness. I just spread some of the skirt frosting up into the top until it was a gradual decline in thickness. This doesn't need to be perfect since there will be an overlay.
Pipe the overlay by creating small details with the tip #2. This wedding dress had a floral/leaf overlay so I kept it simple by piping small hearts as the leaves and small teardrops to fill in other spaces.