Sheath mini dress crochet lace XS Staring at Stars

Tank top (sleeveless) sheath tiered midi dress in a crochet lace pattern. Mauve pink color. Scoop neck with a scallop trim along neckline. Hidden side zipper with hook & eye closure. Inside lining. The back has only what I can call a bleached color flaw but I'm certain it came from the factory that way. Most noticeable on the bottom trim but there's an area on the shoulder with it but it almost looks intentional, like the thread was discolored in those areas. I have no idea what to make of it, please see photos. Otherwise good used condition. Size Large Material: -Shell: 100% cotton -Lining: 100% polyester Bust: 21" Length: 36" Flat lay measurements.