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>>149806483
Footbinding, although dating back to the Tang Dynasty (618–690 and 705–907), only began to spread outside of courtly environments during the Song Dynasty (960–1279). The "Ballad of Mulan", however, is set during the Northern Wei Dynasty (386–535), thus predating the earliest known instances of the practice.
That said, the Disney adaptation wasn't intended to reflect accurately the visual culture of any specific Chinese imperial dynasty. Instead, the China of 'Mulan' is a fairytale-style amalgamation, not far in spirit from what is the case with Agrabah in 'Aladdin'.