Good news: Turns out that wearing the same pair of jeans every day isn’t hazardous to your health.
University of Alberta student Josh Le wore the one pair of tight, raw denim jeans for 15 months starting in Sept. 2009. At the end of his trial, he tested the pants for bacteria. He and his professor, Rachel McQueen, found that the most bacteria accumulated in the crotch area of the jeans — 8,500 to 10,000 bacterial units per square centimeter — but overall, the jeans were still safe to wear.
McQueen said that the bacteria levels in the jeans were similar post-wash and pre-wash.