First, imagine the A4 paper in your hand. The size of the A4 paper is 21cm x 297cm。Now, if you roll this piece of paper into a cylinder, its diameter is approximately equal to the bust of a C cup. And the height of this cylinder is almost the depth of the C cup. This means that the bust of the C cup is the same width as the A4 paper, and its depth is the same as the height of the A4 paper.
Secondly, if you've ever seen a 600ml can of Coke or a bottle of a common shampoo, they're about the diameter of a C-cup bust. That said, women with a C cup have breasts that are comparable in size to these common items. This way, you can roughly imagine the size of the C cup by comparing the items.
Furthermore, the size of the C cup can also be compared with some common fruits. For example, a medium-sized orange or persimmon is about the size of a C cup. If you hold an orange or persimmon in your hand, you can intuitively feel the size of the C cup.
In addition to this, you can also understand the size of the C cup through some daily experience. For example, if you've ever worn some tight-fitting clothing or a swimsuit, you may notice that some of the clothes adjust to the size of your bust. If your bust is a C cup, then you may see the C cup logo on these clothes. This way you will have a clearer idea of the size of the C cup.
Overall, the size of the C cup is a relatively large cup, but the exact size will vary from person to person. Regardless of your body shape, the most important thing is to find underwear that fits you to ensure comfort and confidence.