Wasn't long ago I was rooting through my closet and I had a garment bag with my USAF dress uniform in it on the bed. It was "suggested" that I should get rid of it, I'll never wear it and it wouldn't fit anyway. I took it out of the bag and put it on. Not sure what bugged her more, me having something I didn't wear (not many occasions to wear a vintage uniform) or the fact I could still fit into something from 40 years ago.
Back in my harley days I'd buy one or more shirts pretty much everywhere I went. Aside from the souvenir aspect there was a practical side to it - it was a clean shirt. Cargo space on my bike was pretty limited and having a clean shirt to put on was a bonus. So generally you leave on a trip with what you're wearing, and come back with a several changes. Some were really expensive/nice (intricate patterns/screening/unique), most are just the premade ones that a dealer or event screened something on the back. When I worked production I usually wore them every day and once in a while someone would comment geez, how many of those shirt do you have. Works out that easily enough to wear a different one every day to work and not repeat for a year or so. So yeah, you "need" that many, you wouldn't want to wear the same one twice in a year.
Mark B.
Albuquerque, NM