Good try at getting pictures of woman whom are well endowed. Correct me if I am wrong, maybe you might like to take your fantasies elsewhere.

At OP, you could try the lingerie shops. I won't recommend normal bras because they lack the support needed for vigorous activities. What the sports bra does is to push down the breast so it's flattened causing it not to move too much. Bear in mind that without proper attire, she can suffer from torn tissue and that's something you don't want.

Worse case scenario, order online. Western countries for obvious reasons should have appropriate sizes.