The bed sheet just requires printing the material (dying) with the specific thought of where you are going to place the pattern piece.
The curtain looks like an effect you get by layering cloth. Its not hard, but you really need a dummy with the correct hip ratio so that you can pin each layer to it, seeing that each one lays properly.
Thats great analogy but the whole art work is cook and trust me if this is a physical dress people would so marvel at it.
They're beautiful.