My sunglasses are from American Eagle Outfitters. Only $20, but they're pretty nice, and since I'm bound to break/lose them sometime in the near future (like I do with all my sunglasses!), it won't be too much of a loss.
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alpha delta pi diamonds are a girl's best friend!
I have a pair of tortoise Maui Jims that I wear most of the time. They're polarized and not cheap, so I wear them fratty-style on my Croakies (really).