Classic workwear trousers in less common grey colour, made by great established Adolphe Lafont. 36W 30L, marked as French size 48.
Button fly, belt loops, 2 hip pockets, 1 back pocket, 1 tool pocket on the right leg. Patch on the front lower part of the right leg. Worn condition, the fabric feels softened from wear and they are a couple of very faded stains faded into the fabric, hardly visible. Lafont label. 
65% cotton, 35% polyester.
Most likely late 1980s/early 1990s.