More precise classification: past-participial adjective derived from the verb “sequin”.
She wore a sequined dress that sparkled under the party lights.
Elle portait une robe pailletée qui scintillait sous les lumières de la fête.
Transitive verb meaning ‘to decorate with sequins’.
She spent the afternoon sequining the costumes for the show.
Elle a passé l'après-midi à pailletter les costumes du spectacle.