this outfit from 1973, Bjorn's outfit is inspired by this one from 1975, Frida's by this one from 1976, and for Benny's, I used this outfit from 1977 as reference.
For their career outfits, I gave them outfits that are inspired by the cat dresses, but of course they're not all that accurate since there isn't much to use among the sims outfits as well as the Custom Content that I have a lot of.these outfits from 1980. (I know the hair is wrong, but until I get better hair, this is what I have for now.)
And here are some better closeups of their faces.
Did I do a good job recreating ABBA in the Sims 3? I think I did. :) Maybe I'll try to get more custom content later to try and get some better hair for them, but I'm still really happy with how they turned out. Anyways, that's all for now.