I am also a 38A. The lingerie store I went to had several different 38As in stock, none of which fit really well. I'm kind of a small 38A: with conical breasts, I have the projection to be an A, but not the volume to fill the cup of most bras. They also had bras sized in small-medium-large. The medium fit 34C, 36B and 38A. The band is a little snug, as you would expect, but it fits and doesn't require extenders. My backup plan, had I not found that one, was to get a 36A or B with an extender.