I've been itching to do this costume for many years now, and I finally had an opportunity. Brent Spiner (Lt Cmmd Data from TNG) was at Star Fest this year, and since I would make a TERRIBLE Data, I went with Troi.
This is the asymmetrical green/teal dress from seasons 4 and 5. It's made from a cotton interlock (comfy!), the shoes were covered with the same material to match and the tights were dyed to match. The headband was wrapped in the same material and detailed with crystal beads and sequins. The hair is a 3/4 wig with additional extensions added for volume.
I made a purse to match, because, well, where was I supposed to put a pocket?!
I only have 1 minor alteration to make before it's perfect.
Picture taken by Darth_Hair.