User blog comment:B214/Episode 17 Review/@comment-1746153-20141028172434/@comment-1746153-20141030105740

Yeah, but they are supposed to be wearing their formal outfits (dresses and suits) when they go meet Bolic. As in, they do in the manga, namely here.

If you want me to be straightforward, I wanted to see Ran in a suit since I kind of hate his casual outfit. But since we see them being introduced to the four demons in the preview and they wear casual outfits, something tells me that they'll skip that formal wear scene altogether.