This one was kind of glitchy for me. Took me a few matches to get it. Whenever you play a event in World Tour, you unlock something when you beat that event. Most of the time its socks. Go to 'Edit Player' (under Upgrade Player) > Apparel. Choose the article you just unlocked, and the next match you play you will get this achievement at the end.

Glitch note: If you are having problems unlocking this (which I was), I turned off my box, came back to it with that same team, and it popped at the end of the match. So try that if you are having problems