It is not made of grass, it is up to you whether you want it how long the skirt. I just estimate how long I need and cut the material. You can see there is long and short of the material.
The material is cloth fabric, I choose green as they look like leaves. You can use other material to make it, while mine takes around a week to complete it. That's because there's a lot of cutting and measurement. I went back the shop to purchase the cloth fabric again because not enough. lol