The death of a man wearing an expensive suit found in a park at Brunswick West is being treated as a homicide, police say.

Police are yet to identify the man who was wearing a luxury brand Ermenegildo Zegna​ suit, priced at up to $5000.

The man, aged 50 or above, appears to have been attacked with a weapon, possibly a knife, Detective Senior Sergeant Stephen McIntyre said.

"There is blood that has been flowing from him ... so there is obvious injuries," he said. "He's been assaulted, we would expect in the car park."