Uhm the scenes mostly play in their film setting, in his house or at the agency.
you don't necessarily have to cover up yourself in an environment that already knows who they be working with. But in chapter 16 pg. 2 or 28 pg 3 you can see some sunglasses.
Second kind of places are at restaurants/bars. Here again, you don't cover up when you want to eat and drink with your colleagues.
Third it's either night or no one is around (the last chapters)
And lastly, you gotta know that he isn't that well known yet (the restaurant owner asked for a photo with only the girl not him, thus indicating that ")
But he did wear a cap in chapter 27 pg. 3
and in ch. 23 pg. 6 theres that girl covering up herself.

I believe the author is too limited in placing a believable sense of fashion for these actors, like almost everyone is dressed with plain t-shirts. The art kinda looks even boring now. I hope the story doesn't do the same.