Loft Riviera Slim Sailor Pants

Great condition! SIZE 8 24” inseam Riviera Slim – fitted through the hip and thigh, with a semi slim leg Nautical buttons Front zip with hook and bar closure. Belt loops. Slash pockets with button trim. Back welt pockets. There is a small spot on the back pocket (see picture). I also place the tape measure for reference. I have tried to get it out.