go to a community lot that has clothing racks, then select the rack and pick buy clothing. it will bring up a window with all the clothing you can buy. once you have everything you wish to buy hit the check and your sim will purchase the clothing.
when you get home, make sure you have a dresser so you can "Plan outfit" and change your sims' clothes.
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You have to call a taxi and go downtown or to your neighborhood shopping district. Then when you get there, click on one of the clothes rack and click "Buy..." then you can choose some clothes to buy
You have to go to a shop and then buy some more clothes off the clothing racks.
On the Sims 3, what I do when I want more clothes is I go to my closet (where you buy from buy mode) and I click on my closet. Next, I click Plan outfit where you can design your own outfit and you don't even have to pay! Isn't that amazing? So that's what I do to buy clothes. If you want me to explain how to do it just ask, how do you design clothes on Sims 3.
You can get new maternity clothes for Sims 2 by downloading Squinges mod; pregnant Sims wear any outfit.
The Sims 2 bodyshop is a place where you can make custom sims and clothes for them.