Chiffon bridesmaid dress with V neckline and cowl back detail.  It also features a twisted waistband.
 
Size measurements:
Size  16                       Size  20
Bust:  37.5"                 40.5"
Waist:  30.5"                33.5"
Hips:  41.5"                  44.5"
 
Available in Mulberry and Dusty Lavender but shown in Persimmon.