shako cap
A tall, cylindrical military hat, usually with a visor, sometimes tapered at the top. It is usually adorned with some kind of ornamental plate or badge on the front, and often has a feather, plume, or pompom attached at the top. This can also be used when characters are in a marching band and wearing this cap.
Take care not to confuse for a top hat.
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This tag implicates hat (learn more).