Striped Jumpsuit with open back

Striped jumpsuit with open back has a missing button but there is a button replacement as shown in photo I am is brand new it’s a boutique item it’s black-and-white size small no holes or stains never worn Will offer a little discount for the missing button and no size tag not sure why it doesn’t have one. You will need to be able to sew or know someone that can sew the replacement button back on