/cgl/ - Cosplay & EGL

New to cosplay, decided after having a good think on it that maybe this wouldn't be too hard to do, but I was hoping someone could set me on the right track.

I'm thinking the top of the dress is just a standard shape, nothing too challenging there. The skirt seems to be where things get a bit more complicated. In my mind I'm thinking it's just a circle skirt, not sure how I'd go about making the lifted portions (Any tips would be great). Then for the piano keys, I could just make a long, pleated strip and sew on the black segments, then attach this to the edge of the skirt? This probably makes more sense in my head than it does writing it down.

Black cotton is about £4.50 a metre where I buy from, and white's the same, so I'm not sure if this would come out cheaper than just buying the outfit, and since I'm worried about it looking kinda shit, I'm a bit iffy on actually going ahead with this.

Any tips, advice, etc would be greatly appreciated.

mayu from vocaloid is really cute, and not as much of an ita as she could have been