This Jensen Ackles photo contains
demoiselle d'honneur and demoiselle d’honneur.
There might also be
bouquet, corsage, posy, nosegay, robe costume, robe complète, frac, manteau de queue, queues, cravate blanche, cravate blanche et la queue, robe longue, tailcoat, tail coat, tails, cravate blanche et queues, habit, robe pleine, queue de pie, and robe.