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Moved to Sims 3 Discussion as this doesn't really need to be a meshing question.
Just use the weight slider when creating them in Create a Sim. You can make rather frightfully skinny sims that way. As long as they make even a remote attempt to take care of themselves (i.e. exercise occasionally, and don't eat junk food) they'll stay skinny.
my simblr (sometimes nsfw)
“Dude, suckin’ at something is the first step to being sorta good at something.”
Panquecas, panquecas e mais panquecas.