Mate, all of Europe's top leagues and lots of others kits are made in Chinese factories. Do you honestly believe they have a special Everton kit factory? So you won't believe a fact from a mate who works with it all???

Basically a roll of fabric might produce 500,000 kits. Everton might order 450, 000 kits. They still run the whole roll of fabric as it makes economical sense eg. It's already set up. They use the full roll. There are loads left over, so they use them. The footy teams aren't arsed as it's a minute lost compared to profit. The factory then sell them on as 'dead stock'. Its common practice. The kits aren't made to order. They are produced en masse.
Honestly where do you think footy kits come from?