This fabric treatment is a lot like scoring paper to get the right folds. However, in this particular design, the use of "scoring" is not to create a fold line but to make a design detail in an otherwise plain fabric.
From Rachel Comey, a modern crossbody bag in Melon. Features round design, suede construction, magnetic closure, gold-tone hardware, adjustable strap and exterior gold tone metal "RC" logo. Unlined. • Crossbody bag in Melon • Round design • Suede con