Usually under armour boxer-briefs for support.
Of course! Many sports players wear it as underwear and not just for sports, even as an everyday underwear. There is no reason not to.
Soccer players in italy wear (Home):blue (Away) White
Soccer players almost always wear briefs. The Sloggi Mini Brief is used by a lot of football clubs. There is nothing special about them, they are just ordinary briefs and you can buy them in most department stores. They DO NOT wear jockstraps as a lot of people think. That is a total myth!
They all have to wear them.
soccer jersey, soccer shorts, soccer socks, shinguards, and cleats.
Players wear helmets when playing American soccer.
I don't think they do. From what i see in women's tennis matches, they wear a variety of underwear that looks like the kind of underwear that could be worn on the street.