Distinctive clothing remains the same at all times (7)

I believe the answer is:

uniform

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'distinctive clothing' is the definition.
'uniform' can be an answer for 'clothing' (uniform is a kind of clothing). I am unsure of the 'distinctive' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for uniform that I've seen before include "Official wear; unvarying" , "Dress of distinctive design worn by members of a group" , "Tunic; even" , "Unchanging in form or character" , "Distinctive outfit" .)

I've seen this clue in The Irish Times.

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