This is a koi tail made for scardykat. It has an articulated skeleton that allows it to sway back and forth when you shake your booty a bit. I took a video that also demonstrates the detachable fin. https://www.youtube.com/watch?v=OX8RUZm1HDs

WIP here: http://www.furaffinity.net/view/13584041/

I learned a lot during this project! I am pretty proud of my detachable fin system. There is a cap to a Sharpie marker secured to the last piece of the skeleton. I grafted a piece of 1/2" spiral steel corset boning to the barrel with the ink removed. The barrel and boning were embedded in a piece of L200 that makes up the rear fin. The purpose of the boning is to add a little weight and sway to the top of the fin. The skin of the fin was affixed with 3M 77 spray adhesive.

The body's airbrushing came out much bolder than I was imagining, but it still looks nice. I made a stencil by blowing up a photograph of goldfish scales, then modifying it to make a repeating pattern. I started with white, then followed with a Velveeta cheese color. I finished it with some glittery gold to make it match the sheen of the spandex around it. Also because glitter.

The webbing and buckle belt is GREAT. I'm never making a tail like this without one. I don't even thread it through my belt loops! I just wear it over the belt that holds my pants up.

Comments and questions welcome!

Material sources:
Spandex is shiny milliskin from http://spandexworld.com/
Foam is super soft foam from https://www.foambymail.com/ there's some lux hq on the base for padding
Webbing and buckles from http://www.strapworks.com/default.asp
Paint is Createx wicked from... somewhere.
Skeleton is foamed PVC from my local TAP plastics.