You can go to The Sims 3 store or just get more expansion packs
If the clothes in-game are not what you're looking for...you can download literally thousands of custom outfits (or individual pieces) online. There are too many sites to list. modthesims.info has a lot of free content including clothing that may suit your tastes.
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You can probably get clothes from the Sims 3 website with real money, or download the sims that people make
When you enter your room which is in your house go to your wadrobe. There you can get different clothes all shapes,colors, and sizes!
that is one of the downfalls of the sims 3, ugly maternity clothing. your sims can't change their maternity clothing.. it is unfortunate
you cant, the maternity clothes just appear on your pregnant sim not for teens! and you can get some at poppy sims
It's not possible to woohoo on the Sims 3 for the DS.