Hi Katrina, My chest measures 41", sooo I must buy a 42 band size bra with a full C cup. And YES I have forms that fill in the cups rather nicely!!!! I could wear a 40D bra but it becomes a little uncomfortable as the day wears on though. A one size larger bra can be hooked on the last adjustment so the elastic will not stretch out. Oh yes, I almost forgot, ALWAYS wash your lingerie by hand and hang to dry, this preserves the fabric.
Mollyanne
