What they said!
Sororities have what is known as, "pin attire" or "dressing to pin", in other words, clothes that are suitable for wearing with your pin. (actually, as I type this, I am wearing my pin at work--dressed in a black business suit, pink scoop neck shell, black dress boots). At the event you describe, I suspect a lot of women will be wearing their pins, which means they will be in dresses, slacks or skirts w/ nice sweaters. If it is a formal dinner, I would wear a skirt/slacks and nice top or the LBD, little black dress someone suggested above. Not cocktail wear, but church/business meeting wear. Jeans are not always your friend.
Have a great time!
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