How to make a tutu in easy-peasy steps:
Each tutu has 6 yards of tulle, 3 of 2 different colors. You could use a little more if you want to make it fuller, but these are pretty full.
I measured each child's waist, and cut a length of elastic to fit...with just a smidge to spare.
I sewed the ends of the elastic together to make a round waist-band.
When you buy the tulle, it comes folded in half. Leave your length of tulle folded in half. Lay the tulle out lengthwise, still folded in half. Cut the tulle in half down the fold. Leave the 2 halves together. Then, cut 3 inch or so strips of tulle across the sections, width-wise. It's easiest if you gather the tulle width-wise in your left hand, and cut with your right hand. It will be jaggedy, but this is what you want.
Do this to both sections of tulle.
I also bought 3 yards of ribbon to match the tulle. This I cut to the same length of the strips.
Next is the gathering.
Gather 3 strips of one color and 2 of another. Every few gatherings of tulle, also add a ribbon. When you gather the tulle, make sure the strips are pretty well lined-up. Fold the strips (and ribbon if you have it) in half.
Now this is the difficult part to understand. Place the tulle bunch on the inside of the elastic waist band (with the band on the outside of the bunch), the loop plus a few inches on the top side of the band, and the rest handging straight down (this is all on the inner side of the band--as if you were making a T). Take the ends of the tulle bunch and pull them around the outside of the elastic band and through the loop at the top of the bunch of tulle. Pull the tulle through, down, and tight. Repeat all the way around the band...I actually would place a bunch on one side, and then go directly to the opposite side of the elastic, in order to make things easier.
Good luck and I hope this gives you an idea of how to make this!
This is from my TR...follw the link and on Page 50-something there are pics of a couple of other tutus made by my BFF, Goofyluver!!! I taught her....hey, I can brag....right??!
But I avoid that time of year, since we live in S. Florida, and we are more flexible on when we can go. I can tell you though, it is our longest duration that we dont go to disney and summer time is agony waiting for fall so we can go again!! 
