Sizes vary between Brands and between different item, take the time to know the right size for you based on the manufacturer's size chart. If you need any more help or guidance, please contact our Customer Services team on 866-316-0162.
For example, band size 34 and cup size B corresponds to a size 4 breast form
Amoena Partial Breast Form Size Chart 
Amoena Partial Breast Form Size Chart