For this outfit, you accessories change depending on what character you want. I'll put what I used below. For the background, I used the kitchen in my house for obvious reasons, and I recreated the room that they all partied in when they're in the dorm.
Hat: Braided Wig (Megumi)
Socks: Bobby Socks (Megumi)/ Black Stockings (Erina)
Shoes: Black Loafers (both)