When the Maryland Zoo Zootini invitation requested guests try to go for a purple, black and white color theme - in honor of this year's Super Bowl champs, the Baltimore Ravens - Colleen Pleasant Kline, 39, headed for the runway. Rent The Runway, that is - the website where you can rent designer dresses. "This was my first time," said the Miles & Stockbridge attorney, adding " I didn't have time to go out shopping." For the shindig outside a Stevenson home, she chose a purple polka-dotted black strapless chiffon Nanette Lepore frock ("I'm a sucker for a polka dot"), which she set off with nude patent leather Calvin Klein strappy sandals from piperlime.com and a pearl bubble necklace with matching earrings that she nabbed from eBay. She bought her black-and-white zebra striped clutch at the Brighton store. Her Michael Kors watch was a gift, and her black pashmina is a longtime resident of her closet. The Hunting Ridge resident describes her style as "classic with a twist."