In high school, I discovered that I was really turned on by seeing my female classmates' panty waistbands, especially if they were either Fruit of the Loom or (especially) Hanes Her Way panties. So one day, I went to Kmart and bought a pack of white cottom Fruit of the Loom panties with FTL on the waistband - and then the next day, went back and bought some coloured Hanes Her Ways. Those late-90s/early-00s panties still turn me on; alas, my collection fell victim to a binge-and-purge cycle.
I don't actually wear panties anymore, partly because my diaper fetish supplanted my panty fetish, partly because I haven't found any panties that excite me half as much as those classic ones. I thought about trying girls' panties - I could fit into some of the bigger sizes - but I'm not quite comfortable with the. That said, I'll happily wear Goodnites, which do a fabulous job of bridging the gap between my two interests.