That sounds about right!
Here's a bigger challenge Abbi Secraa, who has always to my knowledge kept her bra size a closely guarded secret.
Whatever her bra size is, it’s not in the off-the-shelf category; it’s almost definitely a custom size, or modified bras. Based on some other images I’ve seen of her, I’m thinking M+, but back size is hard to determine - possibly 34/36.
Let’s just say she has very, big boobs - and I’d imagine it’s very, very difficult getting well-fitting, suitable support bras.