This Glee 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, three piece suit, and single breasted suit.
These are Mercedes', Kurt's and Tina's Auditions for New Directions.
Mercedes is singing, "Respect"
Kurt is singing, "Mr. Cellophane"
Tina is singing, "I Kissed a Girl"