Of course, being feminine does not merely pertains to one's behavior, it is also including one's looks. For example, a female body builder would not be considered feminine in America (or anywhere in the world for that matter; try the Andromeda galaxy, ladies). Another example would be a male that sways his hips when he walks; that would be considered feminine in America (and most of the world also).
Once again, "femininity" is not merely limited to looks and behavior. Various other factors include clothing, personal belongings, sexual orientation, etc.
The only thing that can really be called "feminine" are ovaries.
But not all women are like that. More than enough women are strong, direct, and independent. What is feminine is what a woman does.
Denim pants, leather jacket, pierced nose, cropped hair, motorcycle, suits and ties, tools. She's also feminine.
It is, in a way, built to fit the male gender role, masculinity.
Feminine traits include but are not limited to: understanding, empathetic, sensitive, submissive, gentle, modest, willowy, and pretty.