Float petition about what one might wear in the Forty Foot (8)

I believe the answer is:

swimsuit

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'what one might wear in the forty foot' is the definition.
I can't judge whether this defines the answer.

'float petition' is the wordplay.
'float' becomes 'swim' (synonyms).
'petition' becomes 'suit' (I've seen this in another clue).
'swim'+'suit'='SWIMSUIT'

'about' acts as a link.

Can you help me to learn more?

(Other definitions for swimsuit that I've seen before include "Bathing attire" , "Beachwear" , "Bathing-costume" , "female garment" , "Outfit for a dip" .)

I've seen this clue in The Irish Times.

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