It's actually not Jongdae's fault this time. Not entirely his fault, anyway. There's apparently a restaurant-wide conspiracy going on that Chanyeol wasn't aware of. Jongdae suggested that they "help" Chanyeol out a bit by getting him this apron, but it was ultimately Joonmyun who paid for the thing. ("It's custom made," Joonmyun said proudly, "So you better use it.")
Chanyeol doesn't understand how an apron is supposed to help until he sees the thing. There's no way in hell he's actually using it.
But at least it's comfortable.