You obviously don't go to Butlins for your hol's then do you Roy!! All women wear a footy shirts there.
You're right of course, a football shirt is what identifies each team, and should only be worn by us, the male of the species but now it has become a fashion accessory which you rightly point out doesn't look good on women, it shouldn't be uni-sex, I mean, it hides those curves, and needs to be pulled in tighter around the waist, and well, it's useless in the wet tee-shirt competition isn'tit? You can't see a damn thing!!