the bowler/pitcher gets a set (called an over) of 6 pitches, and has to get the batsman out by either a catch, hitting the stumps, or hitting the batsman's pads directly in front of the stumps
the batsmen obviously have to make runs, either by running to the other end, or hitting the ball past the boundary rope (4 runs) or over the ropes (6 runs)
The sweater vest was just British colonial policy to mindfuck the people they conquered and enslaved