They are high waisted and fasten with a side zip and button. On the front there are 2 diagonal zipped pockets which add a lovely touch. From Marks &Spencer. They state size 12 but the waist is 26" so I think perhaps that is old sizing.
A gorgeous pair of genuine black leather trousers, from M&S in the 1980's. They have been worn a few times, and could do with an airing as they have. 29" waist. 29" inside leg. 20" across the hip (seam to seam).