MNG by Mango Dress Womens Size Medium Black White Ruffle Neck Tank Sleeveless

This pretty MNG by Mango sleeveless dress is brand new without it's tag.    Tag indicates a size "M" however, please consider the following measurements before purchasing.  Thank you!   Measurements (taken while laying flat):   Bust (armpit to armpit) - 15.5" Length (top of shoulder to end of hem) - 40"