Photo: Jonathon Kambouris

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Old School: Dressy occasions demand a dress.

New Rule: Want to stand out in a sea of long gowns? Go for matching separates, like this sleeveless tuxedo-style jumpsuit from H&M (left) or this printed Sachin & Babi number (right). Both options are absolute head turners.
Top and skirt, Sachin & Babi Noir, $350; and $595;
Jumpsuit, H&M Conscious Exclusive Collection, $80;