It's quite easy to see looking at the shirts that they are inspired by Barbershopwindow.com, which launched the craze for such wrestling shirts with their website last year.
This would be the second time WWE has launched such a line as last year, they issued a series of shirts using insider terminology (Jobber, Kayfabe, etc.), which quickly ended up in the clearance section of the WWEShop website before disappearing.
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