Dita Avalon
Dita Corsair
Dita Siren
Dita Winston
Avalon, Corsair and Siren are of a similar style but have nice subtle shape differences. Winston is of course the stand out here not just in comparison with the others, but on its own. Like many of their optical styles, it's got some classic design in it and should work just as well in a suit as a t-shirt.
You can find all of these styles available at the Dita page.
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