The sleeveless brocade dress is not available in stores yet, but similar pieces by Reese -- who was born in Detroit and launched her collection about a decade ago -- run about $350-400.
Reese also dressed Mrs. Obama for her first Ebony Magazine cover in May. Mrs. Obama's pink pumps were from J. Crew.
People are also talking about Mrs. Obama's manicure- and trying to guess the purple-gray shade she wore on Twitter. Ann Romney, wife of GOP presidential nominee Mitt Romney, wore a red Oscar de la Renta shirtdress to the Republican National Convention. That dress cost nearly $2,000.