Crossword Genius

Not able to stretch in laciest outfit (9)

Ross

I believe the answer is:

inelastic

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

'not able' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'stretch in laciest outfit' is the wordplay.
'in laciest' can be anagrammed to 'INELASTIC'.
However, I'm unsure how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for inelastic that I've seen before include "Lacking spring" , "Firm, not springy" , "Without a spring" , "lacking resilience" , "Supply not sensitive to price changes" .)

I've seen this clue in the Sydney Morning Herald.
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