Well you get the lip service helena dress, and some lacy material, and cut the straps off the dress, sew the lacy stuff along the top of the chest,and alter the skirt part a lil bit.

For the shoes, just get black flats, and tie ribbon around your ankles. You don't even need to attach the ribbon to the shoes, just tie it around your feet (find a pic of helena to see how it wraps up around the ankles) and put the shoes on over it.

You can use foundation to make your lips look white-ish.