You need some loose pants at the very least to tuck into similar boots. Also on his head is more of a wrapping then a Bennie. His revealed chest will be hard for any female to do imho. I have no idea how you could overcome that though. Also most of his clothes on the edges are failing apart, you may or may not want to do this depending on whether you can do it without running the jacket, pants etc.
Really though with Snow, how you portray him (exaggerated manly body movements) is going to be the most important aspect of you crossplay assuming you look anything like him costume wise in the end.
I fell like i'll be posting this a lot so I am giving the best advice I can. Have no idea if it is any good though.