Second type of material used in fateful 2 (4)

I believe the answer is:

silk

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'second type of material used in fateful 2' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'second type' is the wordplay.
'second' becomes 's' (common abbreviation).
'type' becomes 'ilk' (I've seen this before).
's'+'ilk'='SILK'

Can you help me to learn more?

(Other definitions for silk that I've seen before include "brief" , "Superior barrister" , "Ancient double-oared ship could be mire" , "fine material" , "Fabric from larvae" .)

I've seen this clue in The Guardian.

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