custom shapes-dress

How do I add a shape to make a new cloud. I want to make one with a dress shape for my bridesmaids. Where do I get the shape and how do i put it on here?

- Google for "dress clipart" images and find a suitable one.
- Copy its URL and paste in the corresponding box (after you clicked "add your image" in Shapes tab)

That's it

If I create a shape in illustrator CS6, what do I need to save the shape file as?

PNG or JPEG will do fine