Tulle - I used 10 yards (69 cents per yard at Hobby Lobby) because I wanted a really full tutu.
Elastic - 3/8 inch no roll elastic (any width up to 1/2 inch will do)
thread (or just tie in a knot)
I started by cutting my tulle unto 6 inch strips. I didn't measure, I just eyeballed. I also didn't worry if the edges were a bit ragged. Since the tutu would be very full, the jagged edges wouldn't be noticed.
I measured the elastic to my waist size and then cut it about an inch shorter. This ensured my tutu would be tight enough to stay put. Then I overlapped the elastic and stitched it together making a circle. Stitching is more secure than other methods. Your stitches don't need to be precise, they just need to be tight and secure. You could also tie your elastic in a knot if it's more narrow. Just make sure your knot is tight.
Fold one strip of fabric in half and make a loop.
Slide the loop under the elastic.
Feed the two end of the strip through the loop.
Repeat this process until you have used all of the fabric. You can make the loops tighter if you want a really full tutu.
I am sure I'll be making more of these tutus for the little princesses in my life. You can use any color tulle you like or lots of different colors. The options are endless. It's an easy and inexpensive way to create a costume or a play outfit (for a little friend).