The idea is to use methods that will allow the breasts to appear bigger than they actually are. 

Clothing: The clever use of clothing makes the breasts look more prominent. Wearing blouses with more details on the bust region tends to make breasts look larger. Try wearing sleeveless polo necks which will accentuate the breasts.

One very popular way of making breasts look bigger is to wear bras that have gel-filled or foam-filled cups.  This have the effect of pushing the breasts upward, enhancing the cleavage.

Chicken fillets (or officially known as silicon push up bra pad inserts) are silicon-filled bags that are removable, comfortable to wear and can be used to increase breast size by up to one cup. This would be considered the ultimate in bra stuffing (which originally used tissue paper, cotton balls, and the like) to take up space in the bra cup so the breast tissue is pushed to more prominent visible areas.

Push up bras, one of the most well-known of which is the WonderBra, are constructed so that the breasts are pushed up and inward so the cleavage looks so much better.

Make Bigger Boobs Like These

This is a very perplexing question.  Does one really want to make boobs bigger?  Why would one want to make bigger boobs (in other words, make bigger breasts)?  Do bigger boobs serve any function?  Bigger shock absorbers in case of head on crashes in vehicles?  More milk?  Better looks?  Attracts more men?  Oftentimes the ladies’ need to fulfil the wants and desires of society is so strong that they end up believing that the need and desire actually originates from themselves.  However if the ladies know that they want to make their boobs bigger (in more cultured terms, have a breast enlargement) because they feel better about their image, then it is a definite and acceptable reason. 

So, how to make boobs bigger?  There are several ways:

1. Eat more.  When a lady puts on weight, the extra fat is deposited everywhere, including the breasts.
2. Exercise more.  Special breast enlargement exercises: Chin ups, pec-deck flys, any exercise that is designed to strengthen and increase the bulk of the anterior chest wall muscles will cause the breasts to be pushed outwards and appear bigger and firmer.
3. Natural Hormones.  There are naturally-occurring hormones (called phytoestrogens) in plants such as soybean, legumes, chickpeas, flax, lentils and clover that attach onto the estrogen receptors in the breast, and stimulate the growth of breast tissue.  Nowadays they come in pill forms for easier consumption.
4. Artificial Hormones.  These are chemically synthesised estrogenic hormones in both pill and cream forms that will stimulate proliferation of breast tissue.

5. Props.  The WunderBra does wonders, as its name suggests.  These bras push the breasts inwards and upwards to form a deep cleft in between the breasts, making the woman feel more well-endowed.  There are other bras in the market designed to do the same, and they work pretty well for that evening out when one has to wear a low-cut dress, and does not feel she has the breast volume to show off.  If these are not available, silicon pads (often called chicken fillets) can be used, placed between the underside of the breasts and a normal 1/4 or 1/2cup bra.  In the absense of these props, tissue paper or cotton wool has been used to create a similar effect.
6. Suction devices.  Suction of a cup on the entire breast will cause fluid to ooze into the breast tissues, and create a larger more swollen breast.  Do this often enough and long enough and the swelling tends to become permanent as the body reacts to the persistent swelling of the tissues.  One drawback of these devices is that the ultimate size of the breasts is not predictable and is often smaller than expected.  The Bravura is an example of a suction device.
7. Surgery.  Briefly, of two major types.  
a) By injection of thick liquids into the breast tissue to enlarge the size.  The nature of the liquid is very important.  Once upon a time liquid silicon was used because it was thought to be an inert harmless substance.  It has since been proven that this substance causes a lot of harm in the form of embolism into the tissues elsewhere in the body, bad scarring and strange autoimmune reactions in the rest of the body such as joint swellings and pains.  Other liquids proven to be harmless do not seem to be as effective or as long-lasting.  Examples are saline, and hyaluronic acid.
b) By insertion of a prosthesis into the breast tissue to enlarge the volume.  This is the typical augmentation breast surgery that is said to be the most reliable method.Two major varieties of prosthesis, either saline or silicon types, with thick walls to prevent puncture are used.  Each has its advantages and a surgeon needs to be consulted for this.  The augmentation breast surgery procedure is usually done under general anesthesia.

One is thus faced with a bewildering array of devices and measures to make the boobs bigger. It is normally suggested that one takes time to examine each and every one of these measures to ensure that no disappointment results ultimately, and that the lady is fully satisfied with what she has chosen.