I think Ruth's wardrobe has been appropriate for her character. If I'm remembering correctly, her look hasn't involved too much repetition or a formulaic approach (like Marty's straight pants/plaid shirts).
Overall suggestion for Ozark Creators: I would LOVE to see Wendy and Marty in more appealing outfits! Wendy frequently looks unnecessarily frumpy (in all aspects of clothing - shoes, pants, tops). Marty needs more variety - how about mixing in khakis, jeans and/or some dress pants? And please...