Decorated or adorned with many ornaments or beautiful things; dressed up elaborately.
From 'bedeck' + '-ed' (past participle used as adjective). This form became common in English literature by the 1600s and remains in active use.
'Bedecked' has a nostalgic, romantic feel that's why it appears constantly in fantasy literature and historical fiction—'bedecked in jewels' sounds far more magical than plain 'decorated.'
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