Should I tell the guy I’m dating about my kink?

My story is odd and starts like this: when I was in university, I used to date a guy who was on the track and field team. We used to meet after class or whenever we had time. That also means I got used to seeing him in shorts and track pants (particularly after he finished training). Now, he used to wear the kind of track pants that were popular back then, pretty shiny, swishy, the ones that make noise when you walk. Anyways, after dating this guy for over two years, I sort of developed a kink, particularly if worn in a specific way. Seeing him in them turned me on so much that now, I still like to think about it. I never told anyone I’ve dated before about it, but now that I think of it, I might have a fetish. I‘m dating someone new at the moment, but I’m not sure how to bring it up or if it’s even worth mentioning it. Those kind of clothes are not as popular anymore. Any suggestions?