Substance got him dancing in swimwear (7,8)

I believe the answer is:

bathing costumes

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

'swimwear' is the definition.
I can't judge whether this definition defines the answer.

'substance got him dancing' is the wordplay.
'dancing' indicates anagramming the letters.
'substance'+'got'+'him'='substancegothim'
'substancegothim' with letters rearranged gives 'BATHING COSTUMES'.

'in' is the link.

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