The size of a cup depends on its depth. The bust at the highest point of the breast (one of the three measured values) MINUS the length of the next week of the breast is the cup. The formula is: cup size = bust-lower bust. So a cup is 10cm, b cup is 13cm, c cup is 15cm, and d cup is 18cm.

Extended data:

I. Shape

A cup, B cup and C cup refer to the size of cups, corresponding to the size of breasts. And 1/2 cups, 3/4 cups, full cups, etc. Modeling design of reference cups. Choosing different cup designs has a far-reaching impact on shaping and maintaining the chest shape, and also has different effects on matching different clothes.

Second, materials.

1. mold cup (also called molding cup)

The thickness of the mold cup is divided into: thin mold cup, medium mold cup, thick mold cup and so on.

Thin mold cup: made of very thin sponge, the cup shape is good, it can be made into various cup shapes, and it is very comfortable to wear, suitable for women above B cup.

Middle mold cup: high temperature treatment and one-step molding. Not only rely on the support of the steel ring and the tension of the shoulder strap to improve the breast, but also rely on the shape of the mold cup to improve the shape of the breast. It has the function of shaping a round chest shape and is suitable for women with petite or medium breasts.

Thick mold cup: it is molded once by high temperature treatment, and the shape of the breast is improved by the shape of the mold cup, which has the function of shaping a round chest shape and is suitable for petite women with breasts (A cup and AA cup).

Step 2: transparent cups

Cup is made of single-layer or double-layer fabric, with single-layer lace as the most common style, with strong European style, sexy and charming, and good air permeability. After wearing it, it is a natural chest shape, suitable for women with round and plump breasts.

3. girlish girth (also called vest girth)

A special bra designed for adolescent girls is similar to a vest, but only covers the chest to help them develop.

4. Invisible bra

A semi-circular bra made of polymer synthetic material is very close to human breast muscle tissue. With the advantages of strapless and shoulder straps, it quickly became popular all over the world. Its appearance consists of two pieces of silica gel and a front button, and it is worn directly on the breast.

Baidu Encyclopedia: Cup