Bad CC - Instructions on how to find it and how to get rid of it (including list)

I tried three maternity outfits from that site. One showed up fine while the other two made my sim have an invisible body. I went back to the site and found that I will need another custom mesh/outfit for one of the two to work. I downloaded that and although the icon is still messy, the outfit works fine.

For the one you have encountered there is no info about another outfit that is needed but I assume it's the same error. They probably just forgot to put the info.

I have sent them an email.