Having a cockcruncher2000 focused chapter here is actually pretty neat, even if it is just a bonus chapter. Helps balance things to give the MC some attention without the female lead, as, honestly, this is the kind of thing that's intentionally designed to draw all attention to the girl.
...Though I do agree with other commenters that this chapter is a bit odd in the fact that his initial outfit seems mostly fine. Like, maybe we're supposed to imagine that the colors were completely random, with the jacket being purple and the shirt being brown and the pants being green? But even then I imagine that something like that would look kind of intentional, you know? Maybe everyone reading this manga is just too old and American to understand fictional Japanese high schooler fashion, and actually this is the lamest thing a guy could ever wear.