Torontonian John Maguire wasn’t satisfied with the standard raincoat in 1883, so he added a gutter:

The object of the invention is to provide a water-proof coat which can be worn in rainy weather without the wearer’s leg being made wet from water dripping off the skirt of the coat; and it consists of a water-proof coat having the bottom edge of its skirt turned up, forming a trough or channel to receive the water flowing on the surface of the coat, suitable provision being made to carry off the water away from the legs of the wearer of the garment.

“Although the coat is specially designed for gentlemen’s use, it will of course be understood that ladies’ coats may be similarly made.”