Sometimes, the MOB chooses her costume first after which coordinates with the MOG so you don’t put on completely conflicting colors and neither mother is dressed more formally than the opposite.
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If stylish and complicated is what you are going for, think about this sequined ensemble from Alex Evenings.
Mom Of The Bride Dresses By Montage
Mom Of The Bride Dresses By Montage
Look for attire in champagne, navy and even black (yes, it's completely fashionable to put on black to a wedding!) for a refined colour palette.