Crossword Genius

Showing two undergarments is most valiant (7)

Ross

I believe the answer is:

bravest

'most valiant' is the definition.
('brave' can be similar in meaning to 'valiant')

I don't understand the remainder of the clue.

(Other definitions for bravest that I've seen before include "Most daring" , "Most courageous" , "Most handsome" , "Most valorous" , "Most heroic" .)

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