Yeah. Although I'm not sure how those stores handle returns when cash was used for a large purchase. If the person was using cash and spreading out the purchases so he wasn't attracting attention, it would be very difficult to catch unless they started to train their employees. There should be at least a few trained employees that handle all returns over X amount of dollars - enough so there's always one at the store.
The person also must have access to additional labels. For example, they walk into a neiman marcus outlet and buy a Zegna blazer for $500. They take off the labels and tags and sew them onto another blazer and return it. They get their $500 back and keep the blazer, but now they're left with a Zegna blazer with no labels. They would need an extra set of real labels to sew back onto the jacket so they could fence it on eBay. I suspect they are probably taking items into the dressing room and removing the labels so they can use them later (like Eddie's tie example), although a rack full of blazers missing labels would be a huge red flag, so I suspect they're spreading out that part of the operation as well - or maybe they're just keeping the stuff for themselves.
The exception would be those Armani shirts. How is there a $599 security tag on those shirts? That makes no sense unless an employee is in on it. When the shirts were purchased they would have removed the security tag, and clearly that was not the original security price tag from an Armani dress shirt. That bar code on the price tag has to be linked to the type of item with a description, right?