dp was a line of underwear that came out in the 80's by Jockey. They were basically a nylon speedo type brief that came in a variety of colors. The dp stood for double purpose.(swimwear or underwear) New at the time since there was little on the mass market in anything but cotton tighty whiteys in a briefer cut. Since Jockey is an international company, perhaps they are still or again are being made somewhere.
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