I think she is wearing a 7fam Superflare in Los Angeles Dark
http://www.7forallmankind.com/Super_Flare_in_Los_Angeles_Dark/pd/c/43/np/43/p/1441.html
You're exactly right. Rachel is a big supporter of 7 For All Mankind. You might also want to check out the 7's Bell Bottom jean.
FYI - if they are too long on you, 7 will hem them for free when you purchase at their stores.
Ryan