Yes you can now! You have to have the sims3, by itself, you WILL
have to buy the sims3 pets, which you can get from gaming sites,
the best one is The Sims3.com. :)
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If you download an outfit from thesims2.com without a shirt then
yes
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You can download them from either thesims2.com or
modthesims2.com.
Both websites require you to sign up in order to download
them.
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Yes. If you go to modthesims2.com you can read the faqs on how
create and download mods and objects.