Men : Between the tummy to the knee.
Women : Everything except face and hands (palms).
An order from Allah (God).
To make women feel safe and secure from men's evil doings. You know what I mean.
Different men likes to see different parts of women, so better cover 'em all.
Also, when people aren't able to see our looks, they judge us based on our personality. Sounds fair? Yep.
That's all. Hope you get something outta this. :)