The plaintiffs are upset that Nordstrom deducted commissions on returned items from their paychecks.
I worked at Nordstrom in California - where the lawsuit is taking place - the summer after my freshman year of college. Yesterday, I got a letter in the mail asking me to sign on to the suit.
When you work in commission-based retail, you make money when you sell product and lose it when it gets returned. So if I sell you a $1200 Herve dress, but you bring it back next week, I make nothing, which is totally fair.