why would you do that instead of sticking with the theme of men?
There is no such theme. The VN featuring only gay romantic relationships is not at all the same as the game focusing exclusively on men.
. . .you just gave maria a new dress to wear and a silly little wand. why would you do that
Partly, because I made him do it. Several of the old patron rewards to add character outfits were mine, and for one of them I chose “Maria in a fairy godmother dress” because I thought it would be amusing to me. Which it is, because Maria is great and I like her more than half the male characters.
As for why he put the outfit there specifically—I can’t answer, but likely it’s because he needed to add it in somewhere where it would sort of fit into the story, and there aren’t a lot of places it could work.