Reply from a previous comment
I actually don't think they make 38's. They make 37 or 39 I think, but 38 doesn't really exist. Just went and checked my bra's and I only have 32's and 36's.
Ladies who work at bra stores always seem to have great boobs. Or at least they're presented really well. Which is like saying a car dealer drives a nice car or a comic shop clerk knows a lot about comics.