HELP mermaids' outfits are being.. weird

Sorry, I really didn't how to title this  

So I only bought Island Living two days ago (it was finally on sale!) and of course I immediately created my first mermaid. But everything related to her outfits is super glitchy...

A) a lot of the time all of her outfits show up as her swimwear outfit, but when I go into CAS everything is normal (which means she's just walking around town in her bikini all the time lol)

B) usually when Sims go to a different location, they put on weather appropriate clothing - but she's just walking aroung in swimwear or everyday clothing in cold weather and after I made her change, when she travels, she's back in the wrong outfit and then almost freezes to death???

C) she keeps walking aroung completely topless with only bikini bottoms which I assume is because I put a cc nude top on her in her mermaid form - but why doesn't she change into a different outfit in her human form? 

I used the forum search and didn't really find anything similar, is this a known problem with the game or do I have to assume it's somehow cc-related?

Thanks in advance!