Yes,
I am currently a 38A to 38B, and finding a brassiere which fits comfortably and supports me is very difficult. It doesn't leave much scope for choosing pretty colors or lacy styles.
There seems to be a void between 36A and 38B, so that bras in 38AA, 38A or 40A size are difficult to find. I have tried wearing a 36" band with a bra band extender, but that takes the straps further apart on my back, so I then suffer from fallen bra straps.
Also sizing between makes & styles is a problem. I have found that some styles of M&S tee shirt bras fit me quite well after several washings, but other styles in the same 38A size have bands which are suffocatingly tight or have massive cups which would hold three sets of my boobs!
As I get bigger, I should move into larger cup sizes which should solve the problem: 38C & 38D are common sizes.
I tend to bid for used bras on eBay, which can often be secured cheaply. If they fit me well (so do) I keep them, if not I take them to the charity shop.
