That is so beautiful! I think it might be a bit later in the 'Teens...1914-1915. I am picturing it with a petticoat under it to give the skirt more fullness. The waistline and the tiers of lace just remind me more of the mid Teen's, not the early. Does the skirt appear to have room for more fullness? Or is it more columnar (is that a word?)?
Whatever the dating, it is so pretty and so feminine! I agree it would make a fabulous wedding dress.