Don't pass on coat of lace fabric that's ribbed (6)

'fabric that's ribbed' is the definition.
I can't judge whether this defines the answer.

'don't pass on coat of lace' is the wordplay.
'don't pass' becomes 'fail' (as in failing to pass an exam).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'coat of' means to remove the middle letters (only the letters that coat the word).
'lace' with its middle taken out is 'le'.
'fail'+'le'='FAILLE'

Can you help me to learn more?