Vhdos - I know you probably don't want to hear this, because I know what its like to have your heart set on wear a certain dress or a certain designer/type of dress, but have you thought of possibly broadening your search outside of HL? HLs are beautiful and you certainly have the body to rock em, but being that HL only makes a handful of white dresses and even less in your tiny xxs small size, it might be really limiting your options. Especially to be investing so much time and money and stress into a stark white dress (which I know wouldn't have a ton of versatility in my wardrobe).
Heres some I found that are white that might be alright (cut some slack, it was a quick search at popular stores):
http://www.express.com/eyelet-rouch...SIZE_NAME&Mrsavf=category&Mrsavf=Color&Mppg=0
alright, you're right. thats the only one i found

Knowing that they aren't that easy to come by (stark white dresses) Im sure the second HL will be fine, as there are bound to be varying shades.