Precious Strappy airflow top has smocking in the back for a flexible fit.  The straps are adjustable!  And they have a little stretch too, so they help support without digging or being too loose.  The front is fully lined.  Curvy friendly - the smocking is very stretchy.  If you want a snug fit, you may want to size down.
The front does *not* stretch, so if holds you in place.
 
Small fits 32-36 chest.
Medium fits 34-38 chest
Large fits 36-40 chest
 
100% poly
Imported.