Edit the avatar and use the Vampire Bites scripts on the parts you want to go invisible. Their is a male and a female version so you need to pick the right one for the avatar in use.

Female:

UFTS_vampirebite.png

Male:

UMTS_vampirebite.png

You can use it in your own properties but may not always be allowed to use it anywhere else unless in the AG Dim. Save the changes at the bottom of the avatar edit page then save the outfit after naming it, at the top of the page.

The avatar edit page cannot edit Newstyle clothing. It is reached by opening the Profile Tab at the top of the Social Centre, then open the Avatar Tab. That is the avatar edit page. Sent by PM too. I do not usually do this as it fails to answer the question for others who need to know the same thing.