Fix the fundoshi (Patreon)

This work will be complicated, so I write an outline of the work for also myself.  This is the main part (part 1) including the normal state (rokushaku-mode).  It has been located on the layer above the legs, but I'll move it under the leg.  

 This is the hanging state (Ecchu-mode) and cannot be masked because it contains a swinging animation. Therefore, separate it and put back on the layer above the legs to make part 2. 

 This animation is the part that falls off when the string is untied, and I'll incorporate into the timeline of part 2 above.

 This is the knot part of the string, which is an independent part that contains the animation when unraveling. This merges with part 1.

 This is the part that was displaced to the side and was originally located under the legs, so  also it'll be merged into part 1. 

Last, this part is flip-upped Ecchu, and I'll incorporate into part 2. However, when it's flipped up, it has to be above all the parts including the body and clothes, so I'll run a script to replace the layers each time.

The parts that were scattered here and there will be two, simple structure with this plan. I hope it goes smoothly.