E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Black Genevan (A).
A black preaching gown; once used in some Anglican churches, and still used by some Dissenters in the pulpit. So called from Geneva, where Calvin preached in such a robe.
1
The Nonconformist divine leaves his vestry in his black Genevan, toadied by his deacons and elders.Newspaper paragraph, July 18th, 1885 (on Sunday bands).