A bit of investigation led me to the boutique Dress to Kill Miami; almost too predictably, they don’t have e-commerce:/
I contacted the owner who divulged, “It’s called the Inku Dress by Mah Jing Wong, I am the only boutique carrying his line.”
“The price is $195 and sizes run XS-XL.”
“My site will be up and running on Monday for shoppers. For now I can be emailed order requests firstname.lastname@example.org or take orders via Instagram at dresstokill_boutique or via phone 786-391-0263.”
*Update: Turns out you can indeed buy the dress directly from the designer! Get your life at www.mahjingwong.com.