This Couples from Harry Potter fan art contains
bridesmaid and maid of honor.
There might also be
dinner dress, dinner gown, formal, evening gown, gown, and polonaise.
Harry Potter's canon, movie-canon & non-couples:
Couples in this video are Harry & Ginny, Ron & Hermione, Neville & Luna, James & Lily, Bill & Fleur, Remus & Tonks, Cedric & Cho, and many more couples