It's a problem we all have when we buy gifts for our girlfriends, wives or the busty mail carrier. How to get the right size without making a mistake that results in having to get an exchange or refund later on.
The way to properly handle this delicate situation is demonstrated in this scene with the sexy Cassandra Calogera.
Bikinis are the gift you want to give. You look around the shop and find the salesgirl who has a body and boobs similar to Cassandra's foxy physique. You ask if she can try on some of the bikinis so you can see what they look like on a real body, not a dummy.
Not only is Cassandra happy to help, she's also happy to give you a helping hand.
Disclaimer: Bikini or bra shopping doesn't always have a happy ending like this.