That's a beautiful bright orange colour - I can imagine it will look amazing on a green dress. The pattern of the belt looks very nice - I tried to name the stitches but it is really (to me) an unique combination . Some cable and some lace stitches, I guess?
What I'm wondering: it is quite long, how are you going to wear it? Will you add a belt fastener of some sort? Or will you just tie it around your waist, maybe with a bow I wonder, because I'm pondering about making a knitted belt myself and am not sure how to tackle that part... For fasteners are often made of metal and that makes it so heavy - distorts the belt a bit too as the knitting isn't that strong. Any ideas?