What is "unsewed"

Usage examples of "unsewed".

Becky had it made into a pelisse for herself, in which she rode in the Bois de Boulogne to the admiration of all: and you should have seen the scene between her and her delighted husband, whom she rejoined after the army had entered Cambray, and when she unsewed herself, and let out of her dress all those watches, knickknacks, bank-notes, cheques, and valuables, which she had secreted in the wadding, previous to her meditated flight from Brussels!