Located at the corner of W. 7th and Foch Street in Fort Worth, Dean-Kingston rocks an electric blue '64 Cadillac on the roof, and a gallery of old Hollywood glossies in the bathroom. Those details will give you a pretty good idea of the personality of the four-year-old clothing boutique, which announced its impending closure earlier today. Think rockabilly, with a bit of a downtown edge, for both men and women.   Sales Manager Jordan Ralls estimates that the store's final day in operation will come in mid-March, though it may shutter a little earlier or later than expected. In the meantime, a storewide clearance sale is now underway, and shoppers are encouraged to utilize all gift cards and store credits as soon as possible. Dean-Kingston's existing Groupon offer will also be honored (all sales final).   Says Ralls, "We want this exprience to be as painless as possible, and to take care of our customers as much as we can."   Dean-Kingston will surely be missed. Visit Dean-Kingston.com or call 817-698-8323 for more information.   (All photos, credit DFW Style Daily)