Vesper one shoulder midi dress with slit- US size 10

Brand new with tags. Has been stored away (bought for rehearsal dinner for wedding postponed due to COVID). Slight color seems to have rubbed off on it (by the zipper in the back) from storage - shown in pics. Thicker material, form fitting. Out of stock now, bought through ASOS. Bought a size 14, which is like a 10 for US sizing.