Well I have made this pic of the clothes that I found in the "picture" folder! My theory is this:

The arrow is the direction of the changing when you press the F6 button. If your villager has already the last green dress, you can't change it. I had this situation once! (I'm not sure to be clear, I hope so )
And I suppose it's the same for male's clothes but I didn't check it.

edit: sorry, my pic is very small! I hope you can see it!