From the original Grimm’s:
“The King’s son picked [Cinderella’s shoe] up… Next morning, he went with it… and said… “No one shall be my wife but she whose foot this golden slipper fits.”
Then were the two sisters glad, for they had pretty feet.
The eldest went with the shoe into her room and wanted to try it on, and her mother stood by. But she could not get her big toe into it, and the shoe was too small for her.
Then her mother gave her a knife and said, “Cut the toe off; when thou art queen, thou wilt have no more need to go on foot.”
The maiden cut the toe off, forced the foot into the shoe, swallowed the pain, and went out to the King’s son. Then he took her on his horse as his bride and rode away with her.
But they were obliged to pass… the hazel-tree, [where there] sat two pigeons and cried,
“Turn and peep, turn and peep,
There’s blood within the shoe,
The shoe it is too small for her,
The true bride waits for you.”
Interestingly, Grimm’s also points out that Cinderella wore such small shoes because she’d been starved long enough that she’d had her growth stunted. German peasants had a lot darker view of the world than the French nobility who came up with the story.