In the pics below this is a full cloak. BUT this collar could fit a number of cloaks...so it ought to be a collar as it would work fine all by itself. And it is two toned...note the darker purple trim.
[img]http://s17.postimg.org/n9qizqv3j/elsa_cloak.jpg[/img]

It's a cloak with a high neck collar, and it covers the shoulders. DON"T make this a shoulder piece! No. We want to add shoulder pieces ON TOP of this.

Now lookie here:
[img]http://s10.postimg.org/ghm1oskex/Elsa_cloak1.jpg[/img]
Here we see the arm up lifted and the collar piece stays where it is supposed to
I could add spiked shoulder pads to that, and it would look good.
even a laser eye shooting shoulder kitty would work just swell. But a hawk might be better.

Bottom line: a good collar piece that covers the shoulders is essential enough for any number of options/costumes. and this is unisex...all payers can work with this.