Crossword Genius

Uniformly brownish attire? (6)

Ross

I believe the answer is:

livery

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'uniformly brownish attire?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is the entire clue.

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(Other definitions for livery that I've seen before include "Uniform, eg of guild" , "Irritable" , "outfit in uniform" , "The stabling and care of horses" , "Uniform -- suffering from gastric distress" .)

I've seen this clue in the Evening Standard.
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