COHINA's Center Press Drawstring Easy Pants, a brand for petite and short women. Photos 5 and 6 show small black to gray spots (small blue circles) that are barely visible in the photos, located below the right knee (see photo 6). Photo 5 shows a faint stain (large blue circle). I personally didn't notice the stains much when wearing them, as I only saw them from a distance. The original price was about 10,000 yen. I've worn them 3 times.