When I took my granddaughter, then aged 3, to see a performance of the Gruffalo at a local theatre, a party of young Muslim school girls filed in, I'd say they weren't any older than 5 this was a show aimed at the very young. They were all wearing hijabs. It posed the question to me, why a child of that age should be expected to cover their heads with such a lot of material. Is the inference that there is something immodest about hair, in that these children would be deemed "temptresses" if their hair was visible.
I never really understood the whole female expected to cover their head thing. I was raised a Catholic and when I was very young, I remember girls and women were expected to wear something on their heads, but as time went by this custom got kicked into the long grass. The last time I was in church, I didn't see any females with covered heads.
My own thoughts are, if you do believe in a God or omnipresent creator, call him or her what you will, he/she would be okay with uncovered hair, after all he/she created hair, but maybe men should be the ones to cover their heads, their hair being more likely to fall out and therefore more liable to get a sun burnt head
What God gavith, he can also take away, men's hair that is! Clearly God's will, Inshallah!