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zip?piz? / trousers

zip?piz?
zip?piz?

Forgetting to zipper is embarrass.
What will happen when we reverse direction of zipper and lossen the zipper head?
The zipper will slide down automatically even if you forget to zipper.

University

Donghua University (China)

Donghua University (China)
Shanghai, China

Yizhou Gao,
Donghua University (China)

Yuxiang Qiu,
Donghua University (China)