It was during open evening and it was a prospective parent so no way could ask!
They were a sort of Jean/ jogger/cargo, faded black in like a soft tencel looking fabric with a light weave/knit it looked new. (So intentionally light black)
They had patch pockets and no seam down the middle of the leg, because when I searched the closet thing came up had a seam. Cargo vibe but no leg pockets