After defeating Casca you got the Gem of Illusion key item. That item lets you force the game to always show a party member in one outfit, no matter what they actually wear. Try using that item again, toggling off your selection for Aden.
As for the Linux issue, I'm still looking into that. It's a little difficult without owning a Linux myself 😅
Oh, dammit! I am sooooo sorry for the trouble I have caused you, just tie me up and put me in a cave. When I googled the error message and read it COULD BE caused by incompatible savefiles due to platform switching I assumed that was the case here. So I forgot thinking about other possible causes, including the most obvious one. Now I did some further testing and it turned out it was caused by a broken game install or damaged game files on the windows machine. When I downloaded the game again and reinstalled it, everything seems to be working. Stop looking into the issue, there is nothing wrong with the game or my savefiles, the error was on my computer's side and must have been caused by a bad file transfer when I moved the gamefiles via USB-Drive to the Windows machine (because it doesn't have an internet connection, it's a retro games emulation console running windows under the hood). Again, I'm so sorry for troubling you with this. After the reinstall everything seems to be working.
Na, it's not entirely on you, normally I am tech-savvy enough that I should have thought about re-installing earlier myself. Thanks for the info with the Gem of Illusions, I remember getting it and trying it out once, but I misunderstood its purpose and thought it was for previewing or browsing through costumes without having to equip them. As I didn't have many costumes at this point (just the maid) I didn't use it again and then forgot about having that item later.
