Or as they say in Yorkshire: all fur coat and no knickers

Apparently they would be more likely to say "all mouth and trousers", which is believed to be a corruption of the more logical but less commonly heard "all mouth and no trousers" [1].

[1] https://www.phrases.org.uk/bulletin_board/19/messages/511.ht...

Never heard that saying once in Cambridge, lived here 20 yrs