How do you get a mushroom hat on Free Realms?

Okie so i think what you mean is a 'fungus' hat? i dont really know but i recentlly got one, its in the Shattered Past Booster Pack (card pack that you open in tcg) in the Sc shop for 200 sc since its on sale now (better if your a member) and i got it as the virtual reward so you should just hope you get lucky