1, a girl who looks fat, slim and skinny is unlikely to have big breasts. If the breasts look tall, they may be padded or fake.
2, there are real B cups and above. When she moves, you can see her chest shaking and fluctuating. The bigger the breast, the more obvious it is. If her chest looks high, but the shaking amplitude is small, it may be padded or fake. The cup must not be shaken.
3. If she leans forward, the outline of the bra pops up, and the shoulder strap of the bra tilts or seems to slide down, it may be wearing a bigger cup, or it may be wearing a poor bra and underwear.
4. The jacket has lace or wrinkles at that position on the chest, or it exposes the shoulders but can't see any shoulder straps. Usually, this woman's breasts are very small (a cup).
When she is wearing a thin coat, look at the taper of her chest. If the taper looks high and the bottom area is small, it is likely to be an extruded rim bra; If it looks like a round ball on the outside, it's probably the function of shaping underwear. Body-shaping underwear or bra with steel ring folding design can make the chest look much bigger.
6. When she wears a thin coat, if she doesn't use plastic underwear or steel rings to close her bra. Visually, it looks like a "mountain tip" shape: it is usually a cup. "Hemisphere" shape: it is likely to be above B cup.
"Olive" shape: breasts are not small but drooping. Invite her to swim. She usually looks much more obvious in a bathing suit.