This is a sadder ask so if you don't want to read it, that's okay.
But do you think about the effects on Ingo's body from being Lady Sneasler's warden? Particularly his shoulders.
Mountain climbing gives people broader shoulders, meaning Ingo's shoulders might not fit his coat too good. Not only that but climbing requires manueverbility, something that's will likely be restricted by Ingo's coat. I mean, it looks like it will handle it at first yet Ingo's new shoulders and the thick Pearl Clan tunic/kimino will put stress on the seams. It doesn't seem so big at first until you remember that it is one of the few things that Ingo has from Before.
Also the climbing might have given Ingo hunchback shoulders. If the muscles of the shoulders get too large it gives the person a more hunchback appearance, not just from the size of the muscles but also because it forces the shoulder blades into a different position. There are excercises to help with their issue though I don't think they would be widely known. So Ingo's slouched posture might also be a result of climbing too much.
I just thought this was a little interesting. I know everyone goes "Ingo got buffer" but they don't go into a detail of how it affects him besides he's stronger. Imagine how his only way of survival destroys his memoirs of a different time while fucking up his posture and giving him back pain. He's no longer quite as identical to Emmet any more.
NO BUT I THOUGHT ABOUT THIS TOO
Especially the aspect of him and Emmet no longer being as identical!
Granted, I do think their coats are slightly oversized for dramatic effect, so there's probably a bit of room before it starts getting too tight. I also imagine that Ingo's repaired it whenever it rips or tears too much? At least, if it's ever ripped so much that the repair is necessary.
I don't know if "the Subway twins are autistic" is the common fandom headcanon, but I can't see them as anything other than autistic, and the unwillingness to repair the coat fully/get a new coat that looks similar is something that reads to me as very autistic? It's both a physical reminder of the Before, but also I imagine that Ingo just finds the coat inherently comforting due to the weight/texture/routine of putting it and his hat on.
Immensely impressive that he's not lost that hat. I fear what would happen if he lost that hat. (half-joking lol, i am also autistic and the idea of losing something that is both sentimental and also Part Of The Routine is incredibly stressful)
I imagine that the Pearl Clan probably tries to suggest he at least replace the coat with one that allows for better movement when climbing, but Ingo always refuses. His climbing could probably be more efficient with a new coat, but he doesn't want a new coat. So he just makes peace with the fact that he won't be as maneuverable as he could be.
There's probably also a part of him that doesn't want to change, either. He doesn't want to become so different that his coat doesn't fit the way it used to, because what if, if he ever does go home, the people he used to know won't recognize what he's become.