I LOVE the combo of Breton T/sweater, white crops, and denim jacket! Such a classic look. It wouldn't bother me if I saw my *twin* while wearing classics. I do think I would be bothered if I were wearing a budget busting statement dress and saw my (taller, more slender) twin wearing the same thing at the same Event and knocking it out of the ballpark.
I confess that I tend to be a bit oblivious about what other women are wearing other than the woman standing a few foot away from me on public transportation who was wearing the Madewell dress I was contemplating a few months ago. But I DO notice footwear other than sneakers.