Decorated with or bearing a banderole; having ribbon-like bands or banners as ornamentation.
Banderole plus the past participle/adjectival suffix -ed, creating an adjective meaning 'having the quality of or decorated with a banderole.'
You'll see 'banderoled' in detailed art history descriptions—it's the word for those medieval pictures where everything that can have a ribbon banner on it absolutely does, because decorative excess was the height of fashion!
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