Bridesmaids different dresses, all black chiffon. Groomsmen picked their own black suits (same shirt , tie and pocket square). Coordinated but your wedding party can spend what ever they are comfortable with.
Wedding Chicks' 2013 Trends for Grooms: Suspenders ... "be sure that they match his suit color, and if he decides to go with a patterned pair be sure that the rest of the outfit is monochromatic. A great example would be the groom and his men above all – keeping it all in the gray family."