Definition of "surtout"

Yes, I was right: it was Mr. Brocklehurst, buttoned up in a surtout, and looking longer, narrower, and more rigid than ever.

1847 October 16, Currer Bell [pseudonym; Charlotte Brontë], chapter VII, in Jane Eyre. An Autobiography. […], volumes (please specify |volume=I to III), London: Smith, Elder, and Co., […], page 109

The house had been new painted, and smelt of varnish and turpentine, and a large streak of white paint inflicted itself on the back of the old boy’s fur-collared surtout.

1848 November – 1850 December, William Makepeace Thackeray, chapter 68, in The History of Pendennis. […], volumes (please specify |volume=I or II), London: Bradbury and Evans, […], published 1849–1850

He was dressed in the suit he'd bought for his mother's funeral, beaver top hat, silk surtout.

1982, TC Boyle, Water Music, Penguin, published 2006, page 41