What military uniform did I see?

We were fortunate enough to attend the King’s garden party at Buckingham Palace today.

There were thousands of people there and many in uniform.

One man stood out wearing a uniform I didn’t recognise. Very dark green jacket, almost black, with red piping on the collar. Similar colour flat cap. Black trousers, gloves and shoes. A sort of black leather pouch over his shoulder and across the back. Lastly, he had a badge on his upper arm that looked like green and red battery bars.

Any ideas what uniform that was? At a wild guess, I’d say it was the parade uniform of a Grand Moff of the Empire.

Thanks, that’s the one!

Not quite right.......
they're Royal Green Jackets, see large badge on chest of officer.. a crowned maltese cross with wreath
now part of the Rifles, but different cap badge as they are keeping their identity!!
see also here
https://www.cetomilitaria.co.uk/ourshop/prod_50272...

Where are the pictures?