This Couples from Harry Potter photo contains
business suit, suit, and suit of clothes.
There might also be
dress suit, full dress, tailcoat, tail coat, tails, white tie, white tie and tails, judge advocate, and three piece suit.
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