User blog comment:IamJakuhoRaikoben/Chapter 461: That Perfume is for Somebody, Review./@comment-5894890-20151109061234/@comment-7418318-20151109212910

I never said that sacrifice and all that is necessary, but it is how Lucy got it.

If Yukino is just handed it for pretty much free, it'd make all the hard-ship that Lucy had to go through to gain this ability seem... not exactly worthless, but certainly worth a lot less.

And with us seeing no other Celestial Spirit Mage use Star Dress, right now it IS unique to Lucy. No theory or anything, just in terms of how it was used so far.