As many others have said - total scam
As many others have said - this is a scam. The website says (in the middle of the home page) "Fuss Free Returns If it doesn’t fit, we offer returns for non-personalised shirts." The sizing is ridiculously inaccurate. They don't offer any details of how to return (on the website or in the package delivered) and do not reply to any emails. This is basically a criminal scam.