We don't have synonyms for bluegown yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are blue gown and bluejohn.
(n) :
(historical) One of a class of paupers or pensioners, or licensed beggars, in Scotland, who received certain alms every year on the king's birthday, including a blue gown.
(n) :
(historical) One of a class of paupers or pensioners, or licensed beggars, in Scotland, who received certain alms every year on the king's birthday, including a blue gown.