Damn it PA, cant you get anything right?

If i dont have that class + no char slots left to make one because you know why.

How can i get the outfit for my attendant out of a box???

I cant convert the outfit to the class because i dont have one and cant make one. For example i want my attendant to be a Nova, but i dont have Nova and no means to create a char atm. There is no way i can convert the outfit to the attendants class lol, why does the attendant also has to have the outfits locked.

so buy a nova outfit.

You must be referring to a choose your premium outfit box or something, where it opens up to whatever class you're on. 

They should really allow you to choose the class and then choose the premium outfit since they included attendant. This shouldn't be something that a player has to go out of their way to overcome.