NOT SELLING - IN SEARCH OF this dress please! US size 6. Derek Lam Crosby Midi

I’m looking for this dress - 10 Derek Lam Crosby Brisha Ruffled Plisse Satin midi dress in Lavender please. I can’t find it online in size 6, but that’s my preferred size. Any help would be appreciated! I would like to wear it to my cousin’s English country garden wedding, and I would like to style it with iridescent, fairy vibes and a matching fascinator.