Twilight Sparkle is just so ecstatic for the new Hobbit movie coming out soon. [She's a complete nerd =oP]
I know its not the same as Gandalf, but Starswirl the Bearded is just about as close as anyone can get with an original MLP clothes design. If anything, I'm pretty sure that Starswirl was based off of Gandalf anyway.
Starswirl Twilight vector originally by: