Firstly, may I say that the photograph really does not do the garment the justice it deserves and the colour is very much darker.
However, these are a pair of excellent quality cavalry twill trousers by Marks and Spencers.
They are a classic style with waist measurement 36" and inside leg 29".
Machine washable and still with original tags.
Tasteful shade of a very dark lovat green.
These were purchased probably in the 1990's when waist sizes were a little smaller so I would advise that these would fit a 34" - 36" rather than a spot on 36" waist.
They have been hanging in the wardrobe under a suit bag in a smoke free home since purchase. P&P £3.95