Le and McQueen stress that their research isn't scientifically sound because of its small scale but, McQueen said, not washing jeans after every wear is good for the environment and good for your jeans.
"I personally think 15 months is a bit long," McQueen said. "It's better not to wash your jeans after each wear. It takes wear and tear on your jeans. By not washing frequently, you're extending the life of the jeans."
Notable denim maker Levi Strauss did a life cycle assessment on its denim and found that consumers can help decrease their energy use by washing their jeans once a month, instead of once a week. That move reduces energy use by about 40 percent and water use by about 35 percent.
For Le, he has already moved onto another pair of jeans.
"My brothers bought me a new pair for Christmas," he said. "They knew it was what I wanted. They are unwashed since I started wearing them Jan. 1."
This time, Le is competing with a friend to see who can wear their jeans the longest.
"The saga continues," he said.