I always struggle with this one, I rarely buy bowl gear on my own but given my well known infatuation with PSU it tends to end up under the Christmas tree every year so I've got a good bit of it that sits in the bottom drawer.
The only bowl gear I ever bought was an orange bowl T-shirt from 06 (my Freshman year) and a 2017 "Roses for the Lions" hoodie that I still wear with pride, but never to a game. (Big Ten Title makes a 49-52 loss easier to swallow) All the other bowl stuff I have I put on to lounge around the house, work out, or do yard work... regardless of whether we won.
Prior to every season, I bite on the discount email i get with having season tickets from the alumni association or whoever sends it and buy "the go to" for that season. If the season goes well, I'll wear it for every game whether I'm there in person or not. If we lose a couple games.... I wear whatever... like I did after the Sparty Fiasco this season.
I've never worn bowl gear to any game other than the bowl it was intended for... wearing bowl gear in Beaver Stadium is living in the past if you ask me. This isn't the Big House.
Few exceptions... Rose Bowl 1994, Fiesta Bowl 1987, Sugar Bowl 1983