I saw the online tutorial and couldn't believe it, everyone is making this no-sew version of the tutu skirt. You need decorators tulle (3" or 6" wide rolls) and a belt. I sewed a matching sash in place of a belt, so this version is easily machine washable.
To wear, just put on the belt and you are done! Have fun!
I cut the tulle into 2 metre strips to tie onto the sash. You can add as much or as little as you want. The online tutorials recommend 4 rolls for a knee-length skirt on an average sized woman. To make a plus-size full-length ball gown takes 16 rolls.
When you are done, trim the ends so its all even. I think it makes the skirt look less Halloween-y.