I hope this is in the correct category. But in all my years of playing I've never experienced this; I'm guessing there has to be a corrupt file somewhere but I've no clue what to look for.
Basically, whenever I use CASt (regardless of how i access it) I'll edit my outfits with all my custom textures and whatnot, and then when I save it they'll be wearing the outfit but the colors will be one of the basic preset colors. In one case I even entered CASt via the wardrobe while my sim was wearing a custom color outfit, edited OTHER outfits, and when I exited her main outfit (which I did not alter at all) was a basic preset color.
Very annoying because it's like a total dice roll now whenever I want to change anything.
If anyone is wondering all the patterns I'm using are normal base game ones, not CC.

Help very much appreciated! I'm a little stumped.

Edit: just tried to save a custom style as a precaution and it just saves as one of the default presets.