Gunne Sax Style Vintage Wedding Dreas (linen/cotton)

I bought this dress at a vintage store in Portland, OR for $120. I planned on wearing it for my wedding but decided to go with long sleeves. I am a size medium in dresses usually, measurements are 35-31-43 and it fit me well. However, due to the bodice being able to stretch I would say it could fit a wide variety of sizes. There is slight staining/discoloration (see photos) but hardly noticeable. The fabric has flecks of brown/natural fiber look so it sort of just blends in. Unsure of fabric but it feels and looks like linen to me.