Is clingy material worn by Darcy legitimate, on reflection? (5)

I believe the answer is:

lycra

I'm a little stuck... Click here to teach me more about this clue!

'is clingy material worn' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'darcy legitimate on reflection?' is the wordplay.
'LYCRA' is hidden back-to-front in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for lycra that I've seen before include "gear for cyclists" , "Sports clothes fabric" , "Stretchy fabric" , "Stretch fabric" , "synthetic fibre" .)

I've seen this clue in The Irish Times.

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