The first thing to do would be to buy an enhancing bathing suit. You can get all types of bathing suit, bikini and tankini tops with gel inserts, which are very secure and won't fall out. These suits also have very good support, which enhances what you have got as well as adding the fullness of the gel inserts.
In addition to this, you can apply make-up to the area to maximize the appearance of depth to your breasts. Apply make-up sparingly so it is not obvious and creates a natural looking illusion rather than a covering. It is quite easy to achieve this look, and although you can buy specific make up for enhancing your cleavage this is completely unnecessary. All you need to create this look is two different shades of powder; one dark and one light (the exact shades will be different depending on your skin tone).
Put your swimsuit on before you start so that you can tell which parts of your breasts will naturally catch the light given the support of that particular item. Apply the darker shade down the middle of your chest between the breasts to give the appearance of a more strong shadow. Make sure you blend this outwards towards the top to create a natural looking V shape contour around the breasts. Next use the lighter powder (maybe a face powder or pale eye shadow) to catch the light on the top half of your breasts. Make sure all the makeup is blended well and doesn't look too obvious; it should just be a natural extension of where the light would normally catch and where shadows would form. This effect can be made more waterproof by using fake tan instead of the darker powder.
None of you helped..
Heres something that would help...
Your bathing suit comes with a liner (not to show nipples)
What you do is replace the liner with gell pads or thick cloth pads.( you can get at any fabric store or 99cent store).
You place them on the bottom outside of your breast to give it a circular look..
Then apply dark blush to the circle part of your cleavage to make you look way bigger than normal..
Trust me.. It works!!
Get a padded bathing suit or one with an under wire..I also suggest a halter top bathing suit with little to no print. Good luck .I'm a 34A , so I have small boobs myself
One way you can make your boobs bigger is to get stronger in the chest area also find the foods that help breast growth and the foods that don't
Buy some of those rubber things that stick to you and place them in a supportive bathing suit.
Pick a halter type top, with a wide band at the bottom to give you a little lift.
When you bye a bathing suit buy the ones where you have the pad I'm them most of the time they can make you look bigger even a hole cup size
Get a bathing suit top that is flattering and has padded uplifts.
By a bathing suite with some kind of design. It makes you boobs look bigger
Where you pull the bikini round your back pull it tighter round the back and lift your boobs higher then when you have tied it get your hands around your boobs and pull the in towards each other this should make cleavage then just see how it goes good luck