This scene demonstrates how to go about the process.
Enter a bikini store. Look for a quiet one with not many customers. Find a sales clerk who might have a body similar to your giftee. Or just pick the prettiest girl with the biggest tits.
Explain the situation in a very matter-of-fact way without sounding like a perv. Ask if she would model some bikinis or at least one to help you pick the right one.
Tent-pitcher Cassandra Calogera demonstrates. She even goes the extra eight inches and takes the matter in hand.
Happy bikini shopping.
