Sheath party dresses are our favorite and here's why. A deep plunging neck with long sleeves looks very boss-lady-like, but makes the whole dress sparkly. Bam! And you look like a daring and breathtaking wonder woman. Soft fabric is skin tight yet airy, so you can dance and twirl all night long in your highest heels. Full length and an open back with a v-shaped cut is just the perfect mix for you to rock and shine the night away.