I had the honor of painting silk for the inside of a traditional gown for a professor. The regulations for a gown are very strict. There is little or no room for personal creativity. Everything is laid down in detail. Except for the lining. There are no regulations for that.
My client wanted a lining with a story. She suggested a colorful painting, with a lot of movement. A river that follows its own free path. Where fertile beds are created, with room for growth. Specific wishes, but with all the freedom for me to experiment.