The phrase "more bespangled" suggests that something is already covered in glitter and sequins, and is being adorned even further. Antonyms for this phrase would include words like plain, unembellished, and unadorned. These words suggest a lack of decorative elements, and instead imply a simplicity and minimalism. Other antonyms might include natural, unprocessed, and unartificial, which highlight a lack of artificiality or man-made decoration. Ultimately, the antonyms for "more bespangled" are words that suggest a lack of decoration, ornamentation, or embellishment, and instead imply a straightforwardness and simplicity.