I use 12x12x8 prority boxes. I prefer not to wrap or fold my tutus since they don't look as fluffy when you take them out. When shipping 1 tutu I just place it inside the box waist down and when the customer opens the box all they see is a big fluffy tutu
when I ship more than 2 then I do wrap them in tissue to fit them in the box. I can fit 8 tutus in a 12x12x8 box and 4 floor length or tutu dresses.