Everlane silk button up blouse white and black striped size 4

Everlane white top with vertical black stripes. The top is a size 4 button up made from 100% silk. I have a photo showing an up close photo of what I thought to be a stain but I am unsure that it really is. Depending on the angle of the fabric it disappears. It has not been spot treated as it is silk. This is a size 4 blouse with the measurements shown in the photos.