Posting again to report an interesting development in my game:- When I first experienced the "pink bra" problem, I did not have Spa Day or Perfect Patio Stuff. I purchased and downloaded both of those packs the day before Xmas. And since doing so, I have had no more problems (so far) with my Sims wearing the pink bra after changing outfits in CAS! They still wear the pink bra when they are using soaks in a bath (I think they are supposed to), but it disappears as soon as they get out of the bath and they do not have a bra in the shower or when skinny-dipping.
Somehow, downloading those two packs seems to have sorted out the problem - at least for now. I say "seems" because I cannot say that the problem has definitely been cured and that it might not recur at some time in the future. Also, because I downloaded both packs together, I cannot tell which one was responsible - or whether it was having both of them in combination. I just thought I would report my experience, in case it might be of some use to those who are trying to find a solution.
I have both packs and always had the issue so seems coincidence
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I seem to remember whenever bathe with soaks was done, the female sim would wear her swimsuit, whatever had been designated in CAS. And it didn't pop up the mosaic censor for that so that seemed to be standard. And I didn't mind that. That was before the Day of the Dead glitch that started this mess.
After getting City Living, I started a new sim and she worked just fine, until she bathed with soaks, and then she would wear that peach/pink/ugly bra instead of her swimsuit. After revisiting CAS with her, then the peachy pink bra reappeared when she was supposed to be nude for showering, regular bathing, or streaking.
It really is off-putting, even with the mosaic as it makes her torso look really wrong. It would be nice if this was addressed soon.
I'm having this problem, too. I haven't had any CC or mods in my game in a very, very long time and I have not experienced this issue until the latest update. Now all of my female Sims are showering and bathing in a pink bra in all of my save files no matter whether they are old or brand new fresh saves. It's quite odd.
It's the second bug they never fix it seems. In my game I have the pink bra bug and the eyebrows suddenly becoming the color of the hair bug. It's annoying. I fixed eyebrows by downloading and using cc eyebrows, but I don't want to download "nakedness"...
The bra-shower bug has indeed returned. It appears to happen after becoming a vampire and acquiring a second form, and mods are not the cause. However, using a mod to "reset" the characters bathing outfit - one can temporarily "restore" / remove the bra until they transform again. I have tested it out with two new sims - the bug didn't occur until I turned them into vampires, and pre-existing non-vampire sims do not have the problem at all.
I too have noted that changing forms (Normal/Dark form) with a vampire also triggers the pink bra glitch. Actually, changing into or out of disguise with an Alien does too, as far as I can tell. It's got to be something in whatever routine the game calls when you want to change a Sim's appearance in these ways.