Legwear — merchandise to sing about (9)

I believe the answer is:

stockings

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'legwear' is the definition.
I can't tell whether this defines the answer.

'merchandise to sing about' is the wordplay.
'merchandise' becomes 'stock' (stock is a kind of merchandise).
'to' means one lot of letters go next to another.
'about' indicates anagramming the letters.
'sing' with letters rearranged gives 'ings'.
'stock'+'ings'='STOCKINGS'

Can you help me to learn more?

(Other definitions for stockings that I've seen before include "Hung at Christmas" , "Leg garments" , "Women's garments" .)

I've seen this clue in The Mirror.

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