That extra decoration is just putting a hat on a hat.
put a hat on a hat
idiomTo do something unnecessary, to go over the top
The presentation was already perfect, so adding more slides was just putting a hat on a hat.
By adding unnecessary flourishes to an already elegant design, the architect was merely putting a hat on a hat, obscuring the original vision.
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all hat and no cattle
Full of big talk but lacking action, power, or substance; pretentious.
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all hat and no cowboy
Full of big talk but lacking action, power, or substance; pretentious.
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black hat
A villain in a story, especially in a Western (a film or other work of the Western genre).
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brick in one's hat
Drunkenness.
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does the Pope wear a funny hat
Obviously! Rhetorical question in response to a question where the answer is an emphatic yes.
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eat one's hat
Used in a result clause to express disbelief in a proposition expressed in a conditional clause.
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gray hat
A morally ambiguous character; an antihero.
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hand someone his hat
To require someone to depart; to dismiss someone.