Unbuttoned meaning

She frowned as she unbuttoned her blouse.

He unbuttoned his coat and sat down on a bench in the porch.

Jenn unbuttoned her jacket one button at a time.

He sat, sunk deep in a folding armchair, and continually cleared his throat and pulled at the collar of his coat which, though it was unbuttoned, still seemed to pinch his neck.

She unbuttoned the first buttons on his shirt and slipped her hands inside, sliding them around to the back of his neck.