Not sure this is a fetish or not. But each evening when my partner and I get home we change out of our day clothes and into casual gear. We swap socks, shorts and undershirts with each other that we were both wearing that day, then pull on jeans etc. for the evening. I love feeling the sweat from his undershirt in my pits and the smell of his boxers as I pull them on is great.
We wear each others clothes all the time and love it. Do other guys do this?