I know you might LOL at this and not believe me, but I am literally making those shirts this summer. They're being made by a teamwear company called SportReach that I work for part time when im back from uni (Christmas, Easter, Summer). My best mates dad owns the company and he only started it up last year. When it started it was only a private teamwear company doing small club teams - the biggest team I can remember doing was London Welsh - who are still a teamwear team with us. Teams such as London Welsh make a contract with us to be with Nike, recieve their playing kit at a discounted price and then we act as their club shop taking any supporters orders and supplying them with replica kit, polos, trackies etc.
Over last autumn though he managed to secure the contracts for Saracens and Bristol Rugby for this upcoming season to wear the Nike kit. Essentially my job is embroiding and heat pressing the kits! So far I think we are making all of the playing kit and replica kits too - not sure about anything else. My boss in the warehouse went and measured all the players up the other day! One thing for sure is that its gonna be one hell of a slog this summer!