It's possible that Reo's sense of what's inexpensive is a touch skewed; his family, after all, could have afforded Rakuzan's fees even without the basketball scholarship.

Reo smiles, saying,

"I'm glad I could help, then. I'm only sorry I won't be around to see the reaction that outfit gets!"

Because the outfit is perfect, and Kuroko is perfect in it, and Reo would put money on its target walking directly into the nearest person or object when he sees him.