The "Naughty Areas" of the crotch and buttocks are covered with a Skin-Combine material. If you wish to change this skin-tight clothing to something else, you can use the IMVU Female Template, as it uses normal IMVU mapping.

There is a quick and dirty Distorted Fat Frog Legs for Women version which maps around those areas, but at the loss of accurate mapping. Use that version if you aren't concerned about the quality of that region of the body.

You would get better results though by deriving your own version of this pair of legs and applying a patch of fur or scales to cover the area, matching with the color and texture of your avie's skin.

Neither version will work with any clothing item that replaces the lower body, so most skirts, pants, and ect. Please Try-It before you Buy-It to make certain it fits your needs!