Hmm. I know of the "Copy Any Outfit" mod -- have used it some, but I don't know if it's still functional. Pretty sure it hasn't been updated in some time. But from what's been described, you should be able to fix it via other means.
Actually, the first thing you need to do is to repair or remove the offending CC. Assuming it's something you like (if only it worked right), I'm looking at repairing it. Which can be done with Sims 4 Studio. Then once the CC is alright, you can repair the affected bathing (nude) outfit. There's another mod on MTS by Lynire that's been working for me for that. (If you simply try to repair the Sim's bathing outfit without first dealing with the CC, it'll just happen again.)
Luckily, the folks at Sims4Studio have created a whole set of batch fixes that will repair whole directories of CC at a time. So sign up (registration is needed to download, I believe, but it's free and they're good folks there. I've never gotten any manner of unsolicited e-mail from them or anything like that.) and download the latest version of Sims 4 Studio. You can do that
HERE. (Link provided goes to the download topic for the most recent version as I write this. There'll be a description of the latest features first -- scroll down, and there's a big red, "Download" header right before the actual DL links.)
Once you have that, either run the installer if you got that, or unzip the files into the directory of your choice if you got the zipped version. (Same program either way, it's just personal preference if you'd like an installer or zip folder.)
Run S4S, and it'll take a little bit to scan all of the game files -- this generally takes a while on the first run, then gets a bit quicker when/if you run the program later. Once it's done, you want to go up and click on the 'Tools' menu, then 'Batch fixes' then 'CAS.' There are actually two fixes you should run to be sure you don't have any CC messing up your bathing outfits: "Disallow CC for default garment" and "Disallow CC for shower."
When you choose one of those options, it should bring up a requester that will allow you to enter the location of your Sims 4 folders (usually /My Documents/Electronic Arts/The Sims 4/) and a location for the S4S program to store backups of any CC it modifies. It always backs up the original files so if there are any problems after a fix, you can restore them as they were. These generally will already be set to the appropriate directories, but if you need/want to edit them, do so and then run the fix. Each fix works basically the same from the user's side, and after it completes it will tell you how many files it checked, how many needed fixing, and how many it successfully fixed.
Once that's done, you should just need to reset the bathing outfit of any affected Sims. For that, I've been using a mod by Lynire on MTS. You can find it
HERE. It's an 'old-style' script mod, so what that means is that you -should NOT- unzip it. Just place the .zip file into your Mods directory. I'm not sure how familiar you are with using mods, particularly script mods, so I'll also mention that if you use subfolders in your Mods directory, you should not place it more than one folder under the Mods directory itself. (I've had problems with the game finding script mods when I've tried nesting them deeper. YMMV.) Also, make sure that you have the box checked in Game Options to allow script mods to run. It's a separate/additional one from the basic one to load mods at all.
Then load up the household with the Sim that's affected, select that Sim as your active Sim, open the console with CTRL-SHIFT-C and type: "reset_bathing_outfit current" (without the quotes, of course). That should reset the Sim's bathing outfit and it will say that, as well as telling you which outfit the Sim is currently wearing. (IE: Everyday 1, Formal 2, etc.) You can also specify a Sim with first and last name, or even use "all" instead of "current" to reset all Sims' bathing outfits. (Never tried "all" -- seems like it could take some time if you have a lot of Sims, and probably not all of them really need it.)
Once that's done, I would save your game using the "Save as" option. This will save a copy of the game with the reset bathing outfit(s) and by using "Save as" you don't overwrite your old save. That's just to be safe in case anything went wrong. You can always load up the old save and be right back where you were, no worse for wear.
Hopefully, at this point, everything should be working and you're good to go. :-)
Hope this helps!
