How can I evaluate breast sizes?

clampfan101
I've searched all over for information, but it only leads to how a woman measures them to find their bra size.
People are so often asking about things like favorite sizes. However, I don't know how I can have any idea how big a woman is without asking her. Guys talk about girls saying things like "She looks like she's a 33D", or whatever. How on earth can they guess with just their eyes?
Unless I can come across a size chart with every single possible size,(which I have looked for in the past), I have no idea in the slightest how I can figure with just my own eyes...
How can I evaluate breast sizes?
12 Opinion