GF/own bust size

DD cup size, no idea the band size

No cup size is tit size. Band is if they're fat or not.

Cup size is also dependent on band size.
I'm a 26 E / 28 DD and my boobs are medium small.
But most guys don't realize how bra sizing works, even a lot of girls don't and wear poorly fitted bras.
Pic related.

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Wow, that system is really stupid.

I don't have gf

my underbust is 28 inches
bust 29 inches

Lucky you. My GF only has one d.

Its not, bras that only come in 32-38 AA-DD (like Victoria's Secret) only fit a small subset of people and yet women all think they must be within that size range
I'm very petite but not at all flat chested and could never find bras that fit me well because the band was always too big and/or the cups too small.
My underbust is 25.5 in and bust is 31.5. Now that I know my true size my bras and they're actually comfy and supportive and it's wonderful.