That’s certainly an interpretation of First regarding nudity, one that makes perfect sense. The nudism bugs me because it isn’t a necessary interpretation of First regarding nudity. If I were First (and to some extent I am, when I’m playing the game), I would
a) understand completely why people are uncomfortable with me being naked (having learned the social morés surrounding clothing from the many, many books I have read), and
b) avoid, whenever possible, ever being naked around anyone again.
I think point (a) is a matter of consistency. First probably knows a lot about the world. Like @Snoe has pointed out, this knowledge is mostly theory and no practice. But knowledge is still knowledge, even if you don’t always have the experience to apply it properly. If First reads a novel wherein the characters consider clothing important, First will assume that clothing is important in the outside world. First has probably read dozens of such novels.
Point (b) is not necessary at all, but it comes from my interpretation of what it is like to be First (and in a choice game, player interpretation should count for something).
Naked might be natural and comfortable for some people, in some settings, but not in the lab. Naked is when I transform from a person to a specimen. Naked is when the inhaler comes out, and the needles and the electrodes. Naked is when the man in charge touches me a little too long. He whispers in my ear and I don’t like what he says. Naked is a reminder of all the times that I, for all my supposed power, have been the lowest creature in the room. I have never seen anyone else naked, of course, because everyone else is considered a person. I don’t like being a thing, and I don’t like the name First.
My point is that @Camille622 and I both have reasonable and consistent interpretations of a prominent MC character quirk—and these interpretations are directly opposed. To me, that’s a sign of something that could be influenced by character choice, just like personality, movement style, and so on.