Not everyone knows, but Leaf/Blue had a different design in some Pokémon Red & Green artworks:
A picture of Leaf's Pokémon Special counterpart, that shows her unused design more accurately:
And for the sake of the comparison, here is a picture of Leaf's FRLG design:
So, what do you think? Which design do you prefer? Personally, I like the prototype design the most. Her black dress is very cute, as are her hair and boots. The actual Leaf's design isn't bad though, but I am not fond of its color scheme. Her socks are really weird also. Though the red and green color scheme do make sense and match the games she is the protagonist. Still, I really think they should have used the prototype design, for the mentioned reasons and for it being more unique compared to the other female protagonist's designs.