STELLA MCCARTNEY 100% Silk Top Blouse Size Small Purple Floral Boho 3/4 Sleeves

This pretty STELLA MCCARTNEY 100% silk top is in very nice pre-owned condition!  However, one of the cuff buttons is missing.  Please see last pic...  Tag indicates size "S", however please consider the following measurements before purchasing.  Thank you! Measurements (taken while laying flat): Bust (armpit to armpit) - 18"  Length (top of shoulder to bottom hem) - 29"