Isn't that Mr. Sherlock Holmes clicking along through the fog in this magnificent cape coat?
Quite possibly. He habitually wore such a thing, as did many 19th-c. military men, constables, impresarios, Hapsburg emperors, and other dashing, authoritative types.
This example has maximum drama (brilliant flash of Scarlet lining) and is far more versatile than plaid.
You can do without the calabash, too.
Classic Inverness Cape Coat (No. 1991). Calf-length cut of fine merino wool with button-on cape. Five button placket front. Buttoning collar to form stalwart chin guard. Full permanent satin lining. The long inverted pleat down the back elicits deference. Imported.
Men's even sizes: 38 through 48.
Color: Rich Black.