Dianyla,
Here on the Terry site, it says that Exte Ondo tops "run small" and to order up a size:
http://www.terrybicycles.com/detail.html?item_no=5138
I notice also that no one who actually is busty has replied to your thread.
These two things indicate to me that perhaps ample chested women are not wearing this brand of top. Of course there's one way to find out!
Terry is having their 50% off sale today, with free shipping....