The new costume is available through an Event Course right now.
☆ NintendObs Weekly – Monday, November 23, 2015 – Sunday, November 29, 2015.
At NintendObserver, the comments are on Discord.
Click on Community to learn more. 🙂
…
…Wanna play? Buy a Wii U.
And if you’ve already got yours, click on Super Mario Maker for everything you need to know about the game. 😀