I was thinking about the labels you get inside children's clothes today. The ones that say "3-4 years" for example. I was thinking why don't you get those in grown up's clothes? Then I had my brainwave.
I would introduce age labels in clothes to stop people wearing clothes that are the wrong age for them.
eg:
Sequinned tube top - age 16-25
Hoodie - age 12-35
Velour tracksuit - age 50+
Polyester paisley bag-dress age 75+
Baseball cap - age 3-45 (backwards age 3-18)
Who's with me?