Green’s Dictionary of Slang

isabella n.

also isabeller
[rhy. sl.]

an umbrella.

[UK]Hotten Dict. of Modern Sl. etc.
[UK]Hotten Sl. Dict.
[UK]Sl. Dict.
[US]A.J. Pollock Und. Speaks.
[US]Wentworth & Flexner DAS.
[UK]R. Walton ‘Cockney Jack’ 🌐 When Jack finished eating he put his this and that on his loaf of bread, picked up his Isabella, kissed his cheese and kisses, and left for work.