Linden Lab just made this announcement ;

Today, we’re happy to announce that Fitted Mesh is available in the main Second Life Viewer! As we’ve previously blogged, Fitted Mesh gives Second Life content creators the power to craft mesh garments that make avatars look their absolute best. We’d like to thank the vibrant community of creators for their thoughtful feedback and help testing this feature.

For more information, check out the video below, then update your Viewer to the latest release and get creative with Fitted Mesh!