Intimately Free People Polka Dot Print Dress Size Medium

Intimately Free People Dress Size Medium Polka Dot Print Would be fun for Halloween! Armpit to armpit approx 14 1/4” Length approx 33” Really hard to describe/photograph but there’s multiple areas with a discoloration/staining. IMO not noticeable from far away. Up close in some lighting shows the yellow/brown coloring more than others. I have no idea what caused this or if it can be treated/ or possibly could DIY /Upcycle and dye the dress. Please see pics for more details