Re: cas swimwear is glitched

@sirenaxmermaid  That kind of issue is almost certainly caused by mods or custom content.  Try the 50/50 method to sort though them:

https://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content#The_50.25_Method

You may need to test in a new save, since sometimes an existing sim's outfits can be corrupted even after the cause of the issue is removed.  This is fixable; I'm just saying it's easier to test on new sims and avoid the extra steps.