Homecoming prom wedding dress butterfly orange

I bought this dress once used off of poshmark, but it did not fit me so I personally never wore it. I was hoping to wear it to wedding, bc it is lovely, simple but eligant. The tag says size 10 BUT PLEASE DO NOT think it is a size 10. My guess would be better for a size 6/8. Also there is one small light spot/ stain on the back of the dress, I ran out of room to photograph it. It does not obviously stand out though