Footballers wear shoes with stud for the grip that is provided by the small area of stud.
to reduce friction
Footballers wear Jersey, shorts, stockings shinguard, boots.
no, all professional footballers wear briefs not boxers
They wear cleats so their feet can get a grip on wet grass.
so they dont hurt their shins
Footballers are required to wear shin pads/guards.
Same reason as footballers, so you dont slip.