As you may have realised, I'm a big fan of quirky blouses. So I really liked this singular specimen when I watched The Women (George Cukor, 1939). Customer designer Adrian did an impressive job with the clothes, he had to create for the 135 women who appear in this film!
This may not be a proper pick for this FFF section, given that it's not so iconic and a pretty unknown piece, but I loved how Rosalind Russell wears it and impersonates character Sylvia Fowler, a busybody gossip expert.
[Sorry for the pictures quality, they're film stills from the scene]