i of course mean gravity!!!
and yes going in to be fitted, will give you a good idea of your size, then you can buy elsewhere.
bear in mind, it's like any clothing tho, the same sizein a different make, model, will not always match up.
The most important thing is to have an almost perfect 'sizing', and see how that looks on you, and try and source that elseswhere.
Bigger fuller boobs, thats where the problem is, finding supportive, well made bras. You pay for the structure of a bra.
If i was smaller of nork I would no way pay £60 for a bra. There are so many pretty bras out there now, for smaller cups ie a-d.
Yet obviously women with very small backs come in too, and then have to have alterations done to make the band smaller.