For those who don't get it: in Japan, nursery school teachers wear aprons, so it "fits sensei" because that's literally the clothes (nursery) senseis wear.
While white ao dai is elegant and pure, it's not for everyday wear
Since they are so white, any stains are super visible
This chapter brings back the memory of watching some high school girls carefully eating lunch so their ao dai won't get dirty
Sorry for the late reply, just felt like going through some old comments today.
I fully intend to work on the "Freeter" chapters, and actually posted one chapter of it already. Due to the way I mange my time though, I'll likely start working on the next chapters of "Freeter Edition" once I either finish this series off, or get closer to doing so.