Corn (Maize) is native to the Americas, so it should not be used in Chinese cooking.
Potatoes - sweet and regular - are native to the Americas, so potatoes should not be used in African or South Asian cooking.
Etc., etc., etc., etc., ...
Sweeping aside the racist BS, the girl thought it was a beautiful dress, and decided to wear it. If there's any cultural aspect to this, she's showing appreciation for beauty in Chinese culture. And, frankly, she makes the dress look good (
Better than I would! ).