We don't have synonyms for dressing-gown yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are dressing-down, dressing gown and dressing down.
(n) :
Alternative spelling of dressing gown. [(UK, Ireland) An item of clothing often made from cotton or another absorbent material, in the form of a long open robe with a belt to tie it around the middle and fasten it securely; often worn over pyjamas.]
(n) :
Alternative spelling of dressing gown. [(UK, Ireland) An item of clothing often made from cotton or another absorbent material, in the form of a long open robe with a belt to tie it around the middle and fasten it securely; often worn over pyjamas.]