For those who are still confused, this video may help.

About the costume DLC itself, I think it's better than the vanilla game because it's there is no backtracking. You play the stages in order and each different DLC has some unique mechanic making for a more unique experience.

However, if you already played the vanilla game you may be like me and already be sick of the stages but I'm specially intolerant to repeated content so your mileage my vary.

Still doing the whole house thing so this week will be hectic, wish me luck.