The stuff at the outlets is made for the outlets.
Designers have different tiers of clothes. For instance, those tacky Michael Kors bags with the MK are Michael, By Michael Kors. That is the lower end tier. The mid level is Kors By Michael Kors, and the top is Michael Kors.
It's the same for Calvin Klein. There is white label (Macys) and the higher tier black label. The Banana Republic Factory store has clothes made specifically for that store, and they get some leftovers from the regular Banana Republic store. (Same with J. Crew, Guess, Gap)
The stuff at TJ Maxx/Marshalls is either leftovers from too much inventory made that didn't sell to department stores, last season, or irregulars with small flaws that can't be easily detected, and there is no buy back clause, like regular department stores, so they can sell low, but can't return anything back to the vendors.
Source: MY EX WORKS IN FASHION