Easy Trophy, which you can collect right from the Start.
After getting your first Player Cards, you also have to open a "Swag Pack", which includes a Top, a Trouser and a pair of Shoes.
After opening the Pack, just go to the Main Menu -> Card Collection and pick a random Player and press "X".
A "!" shows you, that there a new items to wear. Just pick 1 and press "X" again.
You see, that the Player is now wearing the Clothes you picked and the Trophy will pop.