Personally I think it will look good on orange overalls. Unsure until I see it on khaki shirt.
Brown trousers changed to khaki.
Brown jumper changed to air force blue.
Blue casual long sleeve shirts have been mentioned.
Rank epaulets changing to gold on blue.
Badge now does not have crown above piping shrike. State name is clearer. Checker plate links us to national organisation, as well as the orange colour. Rescue states the aim of the service.