This corresponds to an underbust measurement of approximately 63–67 cm. It is a common band size for many Korean women with slender frames. Cup Size (G):

: While a G cup is large in most systems, on a 65 band it creates a "full" look that is often discussed in the context of the "glamour" (or "Bagel girl") aesthetic—a combination of a "baby" face and a "glamorous" body. Shifting Beauty Standards

If you are shopping outside of Korea or Japan, you will likely need to look for these equivalent sizes: Bra Size Chart - BraForMe

The cup size is determined by the difference between your underbust and your full bust. In the Korean system, a G-cup usually indicates a difference of approximately 25 cm . International Size Conversions

Korean cuisine is known for its variety, flavors, and emphasis on balance and nutrition. A significant aspect of Korean meals is the focus on side dishes, which are usually healthy and nutritious. The concept of a "65g cup" could refer to a specific serving size or daily nutritional goal, which seems to be an interesting and specific guideline.