Brunswick Pro Bowling

Go to Career > Load Bowler > Career Events > Rival Challenge. Choose to bowl against the fifth rival, Farmer Dave. You need to complete the first four Rival Challenges before you can do this Rival Challenge. This is a 1 game match. Win the match to unlock your first pair of pants/skirt depending on if your have a male or female character and get the achievement. I had to bowl a 150 to win this match. CPU scores will vary.