SINGAPORE (Reuters) - U.S. President Barack Obama invited fellow leaders in the Asia Pacific Economic Cooperation to a summit in Hawaii in 2011, but may have alarmed them with the dress code.

The Asia Pacific Economic Cooperation, which concluded on Sunday 15 November in Singapore, is an annual meeting best known for a tradition whereby presidents and prime ministers don outfits that are typical of the host country.

"I look forward to seeing you all decked out in flowered shirts and grass skirts, because today I'm announcing that we are bringing this forum to my home state of Hawaii in 2011," Obama told his assembled counterparts on Sunday 15 November.

At APEC's first summit, held in Seattle in 1993, heads of state sported leather bomber jackets. Other outfits have included traditional Korean and Vietnamese tops, batik shirts and an Australian outback coat. On Saturday (14 November) night, Obama and his counterparts were resplendent in blue, green, or cranberry-red linen shirts with Mandarin collars, symbolic of Singapore's early Chinese settlers who assimilated into the local Malay culture.

(Reporting by Lucy Hornby; Editing by Bill Tarrant)