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This may or may be not a mesh issue... however, did you download it from here? If you did you should have posted this on it's respective thread because this way you would be warning the creator about this flaw... anyways, it can also be something you are doing wrong, so our wonderful moderator Loverat created this helpful Guide for you to try out
http://www.modthesims2.com/showthread.php?t=46633
If that is not the issue, i recommend you to post this question in the very same thread you downloaded the mesh from...