Cloth that's soft being put on (5)
I believe the answer is:
plaid
'cloth' is the definition.
(I know that plaid is a type of cloth)
'soft being put on' is the wordplay.
'soft' becomes 'p' (musical abbreviation for piano, 'soft').
'being put' becomes 'laid' (I've seen this in another clue).
'on' is a charade indicator (letters next to each other).
'p'+'laid'='PLAID'
'that's' is the link.
(Other definitions for plaid that I've seen before include "Tartan patterned cloth" , "woollen cloth" , "Check fabric" , "Tartan cloth, part of Highland dress" , "Scots cloth - Welsh party" .)