Because it keeps us warm I guess. And imagine how filthy we'd get if we were nekkid! Especially for certain jobs we need clothing like construction workers, they'd get... Stuff all over their junk. I hope this helped.
Yes, hijab is necessary in Islam as it is a religious requirement for woman clothing. Refer to question below.
googkle
Yes if nessary
is a stench pipe nessary
3
so they can work
It is not nessary but it posible.
Yes
2
No degree nessary
an opaqe objecta sorce of light
Many people feel it is not. Matter of opinion.