This contest is stupid for the simple reason that toilet paper is designed, I'll repeat, DESIGNED to disintegrate in the presence of water. Just about any other paper product would have been a better choice. Picture sewing toilet paper. Picture gluing toilet paper. The contest is a joke proving absolutely nothing about one time use products.
.. Judging by the fine detail in the shown dresses my guess is that the paper was reformed, with glue, etc., into other forms and characteristics. What's the point?