This is the 9011th most frequent Portuguese word.
autografada
Signed (by autograph).
Here, 'autografado' is used as an adjective to describe the book that has been signed by the author.
Eu comprei um livro autografado pelo autor.
I bought a book signed by the author.
In this case, 'autografado' functions as an adjective qualifying the dress that has been signed.
Ela mostrou o vestido autografado por uma celebridade.
She showed the dress signed by a celebrity.
Here, 'autografado' describes the record, indicating it was signed by the band.