Alright, I've narrowed it down to three dresses.

Dress A.
I like the blue; it would go really well with Holly's hair and earring, and the flowers go with the leafwing/plant theme.

Dress B.
THis one's also really good.
It goes with the theme, but it's kind of typical.

Dress C.
I really like this one.
I know it would work more for a nightwing, but Mnadrake and Holly both like stargazing, so it could still work.

Let me know what you guys think!

Renx out!