Granted. They fit perfectly the first time you wear them. The next morning/night rolls around and you awaken to find that you gained a little bit of weight. This is brushed off to the side as nothing but water weight. But then the next morning/night rolls around and you find yourself even bigger. After the third day the jeans no longer fit. You go to the store to buy another pair. You find a very nice pair of pants that was not only cheap, but made you look slimmer. You start to drive home when you come across a red light. The second you stop, the new pair of jeans jump out of the window, shattering it. You see them running down the street. You start to chase the jeans, but they gave you the slip before the chase really started. Each night/morning you grow bigger and bigger. You come to find that these jeans are cursed. You'll never be able to wear them again and they will never let you buy or have another pair of jeans. You belong to them now- until you die from all the magical weight that was forced on you day/nightly.
I wish I knew what I wanted.