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Essentially, wearing silk? (2,5)

Ross

I believe the answer is:

at heart

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'essentially' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for at heart that I've seen before include "In one's innermost feelings, in that era" , "Really" , "Fundamentally" , "Essentially" , "In reality" .)

I've seen this clue in The Telegraph.
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