A super super quick tutorial on how I made the antenna for my Princess Tutu wig.
The felt-and-wire method was based on an antenna tutorial somewhere in the cosplay.com forums.
My method of attaching the antenna to the wig relies on having a skin top.
1) Cut 2 copies of the base of the antenna shape out of felt. If you're not sure what shape you like or if the size is right, do it in paper first and check in a mirror. I used white felt and colored it pink with markers before gluing hair on. Smarter people than me would probably just start with pink felt.
2) Take some craft wire and bend it so it follows the shape of the antenna with a few inches sticking out the bottom. Sew it onto one of the felt shapes.
2.5) (not shown) Take the other felt shape and glue it to the first shape (tacky glue works fine) to make a felt-and-wire sandwich. This is the base of the antenna.
3) Decide where you want the antenna on your wig. Then take the base and punch the extra wire through the skin top of the wig.
4) Flip your wig over. Use pliers to bend the wire at a right angle so the ends lie flat against the skin top, then curl the ends. Sew it in place.
I didn't have any sharp edges left after this but if it's uncomfortable, consider gluing or sewing some felt over the wire to keep your head comfy.
5) Cover the antenna with wig hair. I found I had to use a combination of glues to get this to work. Tacky glue worked best to stick things to felt, but didn't stick to wig hair very well. Elmer's glue (white school glue) was good for covering large areas, and the only thing that stuck the wig fiber together well was the got2b spiking glue I use for spiking wigs. Tip: keep a wet paper towel nearby to keep your hands from sticking to everything in sight.
I pulled a little hair from the crown of the wig around the felt base up and just stuck it onto the felt without detaching it from the wig. That only covered the base but helps it blend into the wig. The rest was cut from the back of the wig and glued on. My wig had a zig-zag part so there was plenty of hair at the crown, and since most of Tutu's head is covered by feathers I wasn't worried about thinning it out too much.
Hope this helps!