What is b-69 bra size?

The term "B-69" you've mentioned doesn't correspond to a standard bra size. Bra sizes typically consist of two components: a number and a letter. The number represents the band size, which is the measurement around the rib cage just under the bust, while the letter denotes the cup size, indicating the volume of the breasts.

For example, a bra size of 34B means the band size is 34 inches and the cup size is B. The band sizes usually go up by increments of 2 (like 32, 34, 36, etc.), and the cup sizes typically range from AA, A, B, C, D, and onward.

If you meant a typical bra size, it might be a misunderstanding or typo. It would be more common to see sizes like 34B, 36B, etc. If "69" represents a specific measurement in a different sizing system or format, more context would be needed to provide accurate information.