I used to work for Nordstrom and know a little about how the Rack's get their merchandise. I still have several contacts locally that let me know about special shipments
Most low quantity items come from 2-4 local Nordstrom stores after initial markdown. Larger quantity items and a good portion of the suits on offer are pulled together at regional distirbution points and distributed to Rack stores based on historical purchasing patterns of a store's clientele. Department Manager's also make requests for items their customer's are asking for which may be sourced from any of the regional depot's (Much of the Zenga, Gucci, Versace and Burberry items that hit the Bay Area Rack's originate in South Florida for example). Then there are special purchases (overstocks, bulk purchases from other retailer, etc) which tend to be distributed fairly equally throughout the chain. Lastly, there is merchandise manufactured expressly for the Rack stores which is the stuff you see in fairly large size and color ranges in every Rack (Evergreen is one brand that I remember).