Skins are coded as buyable skins for the Hot Date expansion pack.
If you don't have Hot Date, you can rename these skins to use the
B200mafit mesh that comes with the original game. (For example,
rename L404mafitlgt_DeagUnd81r to B200mafitlgt_DeagUnd81r.)

These skins are also available at the Yahoo group, SimsGoGoGoUnder.
(you must be over 18 to join)