Any art college is good for fashion design
such as parsons in new york
but in order to go to an art school you usually need a portfolio with a wide range of artworks, including those fashion sketches, but you also need other non-fashion related paintings, drawings,etc.
if you're willing to put in the effort and time then you'd probably end up in a great art college
you can also take art classes where they offer fashon classes and drawing classes
p.s. i think fashion and most art is about originality, you probably now this without me telling you, but the more original the better