Raiment is often used in literature to depict a character's status or personality. The queen's raiment was as regal as her demeanor.
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Archaic Tone
Using 'raiment' adds an old-fashioned, formal tone to your language. Modern terms are more casual. In the tale, the knight donned his raiment for the joust.
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Fancy Clothing
'Raiment' often refers to clothing that is elaborate or ornate, and not everyday wear. For the gala, she chose raiment befitting a star.