Edward Marjoribanks, 2nd Baron Tweedmouth, was the son of Dudley Marjoribanks, 1st Baron Tweedmouth, and like his father was a Scottish Liberal MP and later Liberal peer.
The outfit is anachronistic. They didn’t have photography in the sixteenth century!
Me thinks Lord Tweedmouth likes to play dress up!
it should be obvious that that costume was for a “fancy dress party”. Edward actually was a hard-working member of government. And like most of his social level at that time, they also liked to have fun; long weekends at country estates, shooting parties, costume balls, etc.
We often think of people of that era as “staid Victorians” — you might be surprised…
What’s hiding under the chair at right?
Probably a fur rug or throw (like the one at left). Wolf fur was quite popular. Such rugs/throws were common props at photography studios; also the ornate chairs, tables, etc. and painted backdrops.
You can see similar type outfits worn by King Henry VIII which my ancestor Hans Holbein painted.