"Tomosuke, huh... Well, if you trust him, he's in!"

Minako picks up the robes and shakes them out, looking at them with a critical eye.

"You know, the skirts are long enough that you could cut off a bunch and make an apprentice's cape for yourself or something like that! Even if you're not a full witch yet, there's enough magic in the cloth to give you a little power boost!"

Even if Maria's not a proper witch yet, dressing up like one could make her feel like one. And feeling like a witch is an important part of being one.