I need help

So my mother in law always wants to have all of our cloths matching. I'm ok with some matching stuff but almost everything in my closet except a few things match hers. I don't know how to tell her I don't want all my stuff matching hers. She is nice and it's hard for me to tell her this cause I currently live with her at the moment. But it's starting to really frustrate me. She is either very sensitive or just straight up bitchy about stuff. How do I tell her this?? Please any help would be great!!!!!!!