Sims 4 Gallery Downloaded Sims Problem

@Chanana1107  From your description, I'm not exactly what the problem is.  What I think it is, is that there are extra outfits on the downloaded sims.  There may have been some cc used on them that you do not have too.  

So, first thing is to look at them in CAS and see if there are more than one outfit assigned to each clothing category by clicking on the little arrow above the categories.  Then go through them one by one deleting what you don't like/want.

Since you do use cc, that might be your problem too.  Old and outdated cc will do some weird things so look closely at your cc in CAS to see if any of them look wrong.  I have gotten a few things that made the tops or bottoms of my sims disappear  when I put them on my sims in CAS.  So if you find anything like that, you should delete it from the game.  You will need to check everything too.  I had some tattoos that looked good in CAS but turned the sims that had them in CAS completely pitch black.  Removing them fixed the problem.  So check your makeup, tattoos, clothes and accessories.

Hope this helps.