An angel's whole environment--clothes, houses, towns, plants, etc.--reflect (spiritually "correspond to") the mental state of the angel and changes as the angel's state changes.
An angel's whole environment--clothes, houses, towns, plants, etc.--are what Swedenborg terms correspondences. In other words, their environment spiritually reflects, and thus "corresponds" to, the mental state of the angel and changes as the angel's state changes.