Both legs look normal until the cross says one is wrong, and you glance down at your own trousers before you have even clicked. Not knowing which side you are on is the pull, and the tick promises an easy fix.
How the packaging works
Title
The title promises the rule for every trouser type, not just one.
Thumbnail
The thumbnail shows a wrong and a right hem so close you must check yours.
Remix this
Use this when viewers make a mistake they cannot see. Show the wrong and right versions side by side with a cross and a tick, and make sure the two look close enough that nobody feels safe.
The transferable lesson
Mark wrong and right so alike that nobody feels safe.