Tutor told me maybe add some quilting on these design to make it better. For example, sometimes if you make some quiltings, which can change the folding angle of this product. I used some cotton to put underneath the fabric and sew it. But I found out It was quite slippery when I was sewing it. The cotton kept moving when I was sewing it. 

After I talking to technician in the KX stitch workshop, she recommended me to buy some materials  like polyester wadding, upholstery and polyester needle. Because this kind of material could be sewed and also not moving quite a lot like normal cotton material.  I used the sponge to put underneath two fabric layers and sew some quilting spot. I think sponge felt pretty soft and comfortable, especially when they are covered by the silk fabric . 

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