Almost everything is my own design, except the skirt obviously. It cost me about 30 eur - it's a bit more than a costume bought in store but the materials are of better quality. And it's custom-made and well made.
I'm publishing the shirt pattern (size 98) and a head piece pattern. I drafted them myself.
Here are wings explained in picture because I'm too lazy to write it down. You need: (garden) wire, pliers, silver tape, white tights, elastic band.