I just used a nice cotton twill from somewhere like Joann's, nothing fancy. Some people have gone for a more embellished look but I liked the flat colors. Tutu.com sells a selection of fabric suitable for real costumes but as I've said, I don't think it's worth the expense for a cosplay outfit.
hee, no worries! It makes me happy that I might have advice for another Princess Tutu
I made my own pattern by tracing a ballet-costume bodice I already owned and pinning it until it fit right (it took a few tries!) If you're looking for a pattern I would suggest looking at prom/wedding dress patterns (something like this: [link] ). They have simple, elegant bodices without too many seams. You can probably edit the neckline/back as needed to to match Princess Tutu without too much trouble - just cut the pattern out of muslin, sew it together and pin it on so you can see where it needs trimming. Tutu.com also has ballet-bodice patterns for purchase ([link]) but they're expensive and personally I don't think you need _that_ level of accuracy for a cosplay.
Also, I used plastic boning, which you can buy in most fabric stores, but I would actually recommend NOT using this as it quickly got kinks and made the bodice all wrinkly looking Instead (and I used this for the next bodice I made) I would use spiral steel corset boning ([link]). You probably need to buy it online but it's very flexible and still holds the bodice up.
Have fun! And don't be shy, please feel free to ask any more question if you have them
lol, definitely some luck involved there. I made it a little swooshier than it is in the anime (inspired by ~katsu's fanart [link] ) which I think helps it blend in. I happened to have a photo of the wig with just the antenna (no crown/feathers) so I stuck it in my scrapbook ([link]) . It's a better view than the con pictures of the shape.