This gorgeous dress runs true to size.  
This dress is a chiffon dressy crinkle type medium weight material.  
Lined at bust. This dress has a little stretch. 

If you have a larger bust you may want to size up. 

Model is 5’7” tall with a 32B bust

Small - 0/2-3/4, Medium - 5/6-7/8, Large - 9/10-11/12