If you typically gravitate in the direction of a extra conservative look, maintain your eyes open for a not-so-flashy, elegant evening gown with sleeveswith an aesthetic, A-line silhouette.
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Sometimes, the MOB chooses her costume first after which coordinates with the MOG so that you don’t wear completely conflicting colours and neither mother is dressed more formally than the opposite.
It can be recommended to avoid black clothes as those usually symbolize times of mourning.

That stated, having such all kinds of choices may feel a little overwhelming.