Dressed initially in calico, lace and denim (4)

I believe the answer is:

clad

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'dressed' is the definition.
(to be clad in something is to be dressed in it)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for clad that I've seen before include "Clothed, covered" , "Wearing" , "Cover with insulation" , "Provided with covering" , "Dressed" .)

I've seen this clue in the Best For Puzzles.

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