Cartonnier Charcoal Paperbag Waist Trousers

Pinstripe paperbag waist trousers by Cartonnier with tie belt. Sz Medium. Bought at Anthropologie quite a few years ago. These have gotten a lot of love and are still exceptionally wearable. Several areas of discoloration on the belt (see photos)...looks like detergent or bleaching but could possibly be removed. I hadn't tried since it's not too visible when tied. Flat measurements 12" rise 26" inseam 14" waist