There are so many things I'd like to respond to above but I can address these pretty quickly...
And you have added to the great responses Stefanie. But one point that I'd like to make is that I don't perceive my initial actions or reaction as harsh, nor spiteful or some of the other critical adjectives that were previously used. It was simply as matter-of-fact as the SA's original reaction, nothing more & nothing less.
You have pointed out the true essence of this entire scenario in a single post. And the part that I put in bold in your third paragraph could have been written by me (and I'm sure it has been in different words elsewhere). This is exactly what I strive for when I go out.
Very screwed up, something which isn't likely to be solved any time soon given the number of variables we all encournter when we go out and about, whether it has to do with how we present or the unexpected reactions of those we enounter. But let me clarify something. Choices were made, things were said, but trust me when I say I am in no way unhappy about this whole thing. It's an outfit, that's all. Nostalgia was it's call to me and I know I can live without it. Of course I could return to get it at any time now if I choose to do so but really, it really wasn't all that important. I am the type of shopper that if I leave something behind in a store, if it calls to me in the days to follow, I know I must return to buy it. In this case, that call isn't there and it has zero to do with the initial reaction of the SA.
At the end of the day, whether I return to that shop someday or someone else from our community happens into there, I think the road is paved for a positive result.