Yes. If you have the nightlife expansion pack then you can go downtown to a clothing store and purchase clothes there. You later click "plan outfit" on your wadrobe and then you click "everyday" and you will then be able to change your clothes.
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You can unlock Mama Hogg's and Ava Cadavra's.
You can't actually become a mermaid but you can download mermaid outfits, that is the closest you can get to being one.
You don't do that in sims 2 only in the new game - sims medieval.
You can get new maternity clothes for Sims 2 by downloading Squinges mod; pregnant Sims wear any outfit.
To get special sim skins (such as vampire and alien) : Do the "boolprop testingcheatsenabled true" (no Quotaion marks) cheat and after that go into create-a-sim Now press shift N and you will unlock a heap of new outfits, hairstyles, etc.