There are a million tutorials on the internet for these types of tutus. All you need to do is google no sew tutu and you will find heaps. They are super quick and easy to make. The most time consuming part was cutting the strips of tulle.
The onesie was nice and easy too. Just a few bits of ribbon sewn on with a silver star button on top. Voila, instant Christmas tree onesie! I figure this is christmasy enough that when she gets over the tutu she is still in theme. I also have a my first christmas onesie for her to put on if she throws up on this one. I have all bases covered, lol.