Ok, I'll try to attempt to show how I made the Buzz spiral sleeves on Lyddys outfit!
First I took the piece that I had leftover from making the spirals.
Trace the outside edge of this onto some paper to form your pattern piece
Here's what it will look like
Take your leftover piece and put the outside edge on your pattern piece. Move it around until you like the width of it (this one is a little skinny, I would make it wider than this)
Trace the edge onto your pattern paper
Voila! A pattern piece that looks a lot like a banana!
Cut out your pattern piece
Place your pattern onto your leftover fabric piece, line up the outside edge and then you don't have to cut that side. Cut out enough pieces to be able to cut out your sleeve pattern.
Sew all of your pieces together, just like you did your skirt. Of course, your piece will be fabric and not paper like I'm showing here.

And there will probably be a lot more pieces to this, I just got tired of drawing the bananas.
I then pressed it.
Now, place your sleeve pattern onto the fabric. Place the inside part of your pattern (the part betwen "place on fold" and the diagonal cut) on the straight edge of your fabric. I had to sort of stretch it straight, since it had a tendency to curl. (you can't see this in the picture since paper doesn't stretch well)I also trimmed the tops so that the tops of the spirals were all even. (This will be the edge that you put the elastic through if you are making a paesant blouse)
Cut out your sleeve piece.
Your sleeve (although yours will be twice this big, this is only half a sleeve)
I then put a hem around the outside edges of the sleeve.
Sew your sleeve onto the bodice
All done!