Barcelona colours....
Hans Gamper had been a member of FC Basel in Switzerland founded in 1893. As he was also its playing captain in the year prior to his move to Barcelona, a connection is at least plausible. FC Basel has the colours blue and red as seen on the shirt of 2006/2007 below. Depending on the language you read it in, Wikipedia either agrees, tentatively agrees, or refutes this claim
Arsenal did not copy our kit design I believe that Arsenal's kit came from borrowing Nottingham Forest shirts and adding white sleeves
As for the FIFA question no idea.