Maybe you have a stash of silk ties in your closet, or can raid your friend's.. at worst you can buy plenty of silk ties at yard sales and thrift shops for a quarter a tie. A friend of mine made a tie skirt and I wanted to try it too.
I started with a pile of 100% silk ties and gutted them. It doesn't take long to take them apart and I had no idea what was inside.
Then toss a few ties at a time the ties into the sink , handwash with cool water and a little mild detergent. Some ties might run color, so I washed like colors together. hang over the shower rod to air dry.
Now iron flat - I used a little spray starch too, to make it easier to handle. There is a lot more material than I thought in a tie!
Then I just started stitching them together, starting from the widest end, (two rows of stitching to make it less likely to ravel). keep going until you have enough width to wrap around , and sew those end together. The bias cut of the ties will have enough stratch that most likely won't need to add a zipper.
I added a band around the top for a little extra stability, and cut off the bottom points of the ties and hemmed just a little bit.
and here it is all finished: ( yes, that is a duct tape dress form)