As for not matching bridesmaids, the only ones who need to worry about that are MOB and MOG.
Slghtly OT, but at the wedding of a son of a friend of the family the MOB and MOG wore the same dress! different colors, and they look nothing alike, but it was kind of funny, and they were fine with it. It was a longer dress, with a beaded jacket. MOG has very dark hair, and hers was a burgandy, and MOB is tall and blonde, and hers was a pretty royal blue. you didn't know it was the same unless you looked very carefully, and as they are all pretty laid back, no reason to consult wiht each other about what the other was wearing beforehand!