DLC counts towards this.
You can acquire clothing from completing various side quests or by just buying then from Amanda at David's apartment. There are more than enough in game to earn this.
The only issue will be getting the credits to buy everything.
An easy way to get credits below the spoiler tag.
*** Spoiler - click to reveal ***Towards the end of Episode 2, Ronald, the creepy doctor guy, will be in the cargo hold after an event sequence, talk to him until you exhaust all options and do his side quest, which is again, the clover touch game.
Beat it and he'll give you a memory and leave it at David's.
Go to David's bedroom and aa little statue will be on his desk next to the door to the hallway, it lets you play Clover Touch game. Get as high a score as possible and you'll earn some credits. After the game is over, go back in, double tap B to skip, then press the B button when it starts to quit.
You'll get the same amount of credits again. Keep doing it until you can buy ask the clothing.
You can also earn "Hard Worker" this way.