Sometimes fashion trends grow over periods of years. Lace, for example, has trickled its way down from the Prada runway to the tights of half the 19-year-olds in the East Village and 90 percent of the blouses at Forever 21. Cats and cat imagery are similarly gaining momentum in the clothing business. Just yesterday Style.com noticed what we’ve been saying for ten months: Cats are having a fashion moment. Not dogs, cats. Cats, you dog people! Finally, the clothes the sexy cat models showcase in United Bamboo’s 2010 calendar are available for sale, exclusively, at the coolest store in the world, Opening Ceremony. Two feline looks are available, each for $500.