A $10 case for that $50 gift card. A hat and scarf to match your Harry Potter doll. Swarovski-crystal "jewelry" that clips onto a bra. These are some of the items that shoppers are likely to confront in stores this season: "accessories" designed to dress up the gift you're buying -- and in some cases, push up the price.

As stores brace for what's predicted to be the slowest growth in holiday sales in five years, retailers and manufacturers are trying to sell shoppers on add-ons to supplement their gifts.

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