Apron With Sleeves Sewing Emergency! The Cloth Is Ruined, What Do I Do?!?

Sewing emergency! The cloth is ruined, what do i do?!? - apron with sleeves

I am a waitress for sewing a pink dress and spent the last part of my money on the material. my friend has done the bulk of clothing, while I was the sleeves, aprons, coats Petti, and detail. She has an incredible job on the dress, but she has the costume in a bag behind the bushes while I was on vacation. I went on vacation and return clothes that smelled musty, so I washed. Then I realized, its stained rust. So when I tried to put in the sleeves, the dress was darker then the sleeves. Is there any way I could remove the moldy part without damaging the structure of fine cotton to the original color again?