Bathers with nothing on thin jugs (6,7)

I believe the answer is:

skinny dippers

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

'bathers with nothing on' is the definition.
(skinny dipping is swimming while naked)

'thin jugs' is the wordplay.
'thin' becomes 'skinny' (similar in meaning).
'jugs' becomes 'dippers' (I am not sure about this - if you are sure you should believe this answer much more).
'skinny'+'dippers'='SKINNY-DIPPERS'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app