There was something utterly pitch-perfect about Michelle Obama’s dress at the Democratic National Convention in September. First, it showed off her arms. Second, it subtly combined the color schemes of both political parties—a nod, perhaps, to bipartisanship? But most important, it was the work of the young African-American designer Tracy Reese, a native of Detroit. (A version of the dress, Tracy Reese announced afterward, would go on sale for less than $500.) And, to top it all off, J. Crew shoes.