Product Tag could be a solution in here. Please check this screenshot – http://postimg.org/image/7ylol8zsd/. I will request you to please try yourself and let me know the result. I am here to help you.
when i use attributes. the filters bring out all the attributes as options even when the are irrelevant..
like a user will see mega pixels in shirt category. is there no way of filtering the attributes to only show in categories where they are relevant