Here's a quick tutu I made for my daughter, but it would be easily customisable to make for any sized ballerina (I'm thinking of making a large sparkly black one for myself! Life's too short to not own an awesome sparkly tutu, no matter how old you are!)
All you need is scissors, lots of tulle, elastic and half an hour - what could be simpler?
And the best part of all is the pattern is absolutely free! It's my little way of saying thanks to the sewing community for all your awesome support over the years.
You can find the tutorial for it on my blog, Jorth!