It sipmle really allyou have to do is go to this link---> http://thesims2.ea.com/ and go to exchange sims then type in Deidara and you get the whole costume Un!^_V
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No.
Mod the Sims has a large selection of hair and makeup, XMSims has some excellent custom hair colors and styles.
no
If you have nightlife expansion you can by making there turn ons/offs to be what they are eg brown hair sim with a sim who turn offs brown hair will have bad chemistrey
There is no such thing as a hair cheat. If you want more hairstyles or colors you have to download them.