Bouquet's Stripping

If Bouquet take her shoes and socks off in order to become invisible, how would you find her feet if she's completely silent sneaking on you?

Blue Dragon: Bouquet

Bouquet is a young waitress, who is saved by Shuu after she is harassed by 2 customers. After this, she falls in love with Shuu and even gets him to propose to her. Her Shadow, "Hippopotamus", allows Bouquet to transform into anything she pleases. In addition to this, she also has the ability to become invisible.