Customers can be fairly clever. I used to work for a company that sold children's clothes. We had one "special" gal who knew how to work the system.
When she first started shopping with us, her daughter was probably about two years old. And adorable. But as is the case with kids, they grow. Then out-grow their clothes. This particular gem of a customer had a master plan, and sometimes I wish I had thought of it.
Each year as the kid out-grew her clothes, the mom would simply bring in the old clothes and "exchange" them for the next size up. And of course she knew that this particular company was very customer-service oriented. You know, "the customer is always right" malarky. Anyway, it started out slowly. She would simply bring in one or two items each season and state that it must have shrunk in the wash (or something) and could she just have it replaced. But she always wanted the next size up.
It didn't take us long to catch on to her scheme. We kept track of all of her "transactions" and informed our corporate office. They took great pleasure in sending her a certified letter in which she was asked to NOT shop at our store any longer (considering she hadn't actually paid for anything in years...)
Looking back at it now, I applaud her creativity. Over the course of 2 years (the wheels at corporate move very slowly) she got new clothes for the kid by just making that one initial purchase. 
Ingenious! Wish I had thought of it.
Of course for adults, it's not so much that we have growth spurts, but think of the possibilities if you are a yo-yo dieter. You could exchange your skinny clothes for roomier ones if you ate at the buffet of life too many days in a row. Or conversely, trade in your chubby clothes if you've decided that toast is a complete meal and that's all you eat. Think of all the money you could save! Her plan was brilliant 
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