For one who cares so much for baselayers, to have not written about this particular subject before is quite the oversight. Sorry, to be clear, I've certainly written about baselayers - like here - but this article acts as a 15th anniversary celebration of a concept that, bizarrely, seemingly came from nowhere, then went straight back there: The dual-layered football shirt.
In 2002 - and we'll stick with this as a launch date, even if some may have come some months earlier - Nike and adidas, those two titans of football kit design - certainly then - came along with kit designs that brought something a little fresh to the table. Not only was there an outward appearance, but the players had an inner lining, which, to a degree, even contributed to that aforementioned appearance.