Well, if you don't believe his account, then there's no point. His is the only account. It could be completely made up, but it's rather convenient to decide that the parts that work to undermine your theories (and only those parts) must be false.
And of course it's okay that you disagree, but it's the way people disagreed here. And it's simply factual that breast wallet is a widely used, widely understood term. That's hard to disagree with without purposefully remaining ignorant or being disingenuous.
Actually, I don't believe much of what I read on-line, whether the text would tend to undermine my theories, support them, or affect them not at all. Nor did I say that anything "must" be false. I believe my opinion was clearly presented as just that: I used the words, "I think," and "probably" (though "possibly" would have been a better choice). As you are, it appears, concerned with precise terminology, I believe it behooves you to refrain from putting words in my mouth.
A widely-used term "breast wallet" may be, but it is apparently not universally understood. Sometimes, having recourse to synonyms can be useful. And perhaps the OP did so.
Finally, though of course I am appropriately chastened by the suggestion that I may be suffering from ignorance and/or disingenuity (which of those was the sales associate's problem, I wonder), I have decided that additional discussion of this particular component of men's haberdashery is, as poplin so accurately observed, pointless. I do not believe that pursuing the issue further will enhance my life as a disingenue. Therefore, adieu!