Most I've found are suppliers of perfume and accessories -
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For clothing, you can try some liquidators we have in the directory -
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Liquidators get closeouts and salvage items directly from some of the top department stores, so they may have some designer brands in their inventory. Using liquidators is a different ball game to sourcing from wholesalers though, as the product can be in a wide variety of conditions.
You can also contact Dolce & Gabbana and see whether you could resell their products.