I fell in love with an 80 dollar teeshirt at Chico's and decided I would try to drape in on my dress form.
Usually, I'll use mulin or cotton. It occurred to me that using interfacing that is fusible might stick to the dressform and I wouldn't have to use so many pins as I play with style lines.
I used some 1/4 tape for some of the straight lines that I placed directly on the form and then started to drape. An added bonus was that I could see right through the interfacing where I had placed the tape. The stickiness of the fusible interfacing hugged the form . It worked so well. Who knew!