“Outfit Links” is quite a useful feature. For example, in sl, sometimes i play in the military combat community (first person shooter.) Sometimes i do build and scripting. (see: Build Tutorial and Scripting Tutorial.) Sometimes you might go to a dance club or beach. In different situations, you have different set of avatars, clothing items, or huds you wear. It is tedious to take off your clothing items and pick different ones in your inventory to wear. With “outfit links”, you can wear a particular set in one shot.
If you are impatient to watch the vid… see this doc at Source wiki.phoenixviewer.com.