Best answer is to refer you to the "pros". Look at a site called modthesims.com. They have tons of cool stuff there you can download, and stuff on how to do it all yourself.
If you know how to make custom content then you can. Mod the Sims has a "how to" tutorial on custom content.
Happy Simming! <3 FSC
I highly doubt this is possible. You can make a 'look-a-like' of something but you cant bring something from the sims 2 into the sims 3.
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You can't "get" mod the sims 2, it is a web sit with a lot of custom content and hacks for The Sims 2
Here are some custom content sites.The Sims 2 ExchangeThe Sims 3 ExchangeModTheSimsThe Sims ResourceGarden of ShadowsSimbologyMore Awesome Than YouInsimenatorLianaSims2AnnaMariaSims2DecorgalThe Sim SupplyxSIMS.de (mature content)There are plenty more sites than this. If you want more just google "sims 3 custom content".
Download cc (custom content) Search it on Google.
You can get clothes for them by going to thesims2.com and downloading custom content.
You can download custom content a lot of places online, such as Mod the Sims. Just create a log-in, go to the "downloads" tab, pick The Sims 2, and start hunting.
www.xmsims.com is a custom content website which creates custom content for The Sims 2 for PC, which can be downlaoded and used in your game for free. Instructions on how to do so will be on their site. P.S Their hair is brilliant (Y)
most websites don't make you pay to download custom content. but there are a few sites that make you pay a "donation"
The Sims 2 bodyshop is a place where you can make custom sims and clothes for them.