Beach days are here - the sun, the sand and waves. But finding a perfect bathing suit is enough to keep you indoors.   Maybe a swimsuit that promises to make you look slimmer is the answer. This Miraclesuit claims you can "look 10 pounds lighter in 10 seconds."  In its quest to find the perfect swimsuit, Consumer Reports ShopSmart recruited a few brave women to try out more than a dozen slimming suits.   "We got a fit professional to come in with her tape measure and her experienced eye to check out the women in the suits to see if they met their claims."    For Karen, ShopSmart found this 132-dollar Victoria's Secret Firm Control Crisscross Shaping  One-piece did trim all over.  But even better - this 142-dollar Tommy Bahama one-piece that promises a "flattering fit for any figure."     "It does slim you. It does do what it says it's gonna do."    For Cherie ShopSmart liked this Spanx Woven Halter one-piece for 198 dollars. The waist detail instantly slims.  Cherie, "With this suit when I was sitting down, I didn't feel as though I had to suck in my stomach, so that was a very huge selling point for me."   Even better -a less-expensive suit that took one and half inches off Cherie's waist. It's the Lands' End All-over Control Slender Grecian Swimdress for 109 dollars."I like that the skirt hides a lot of evils."  Jody Rohlena, "The suits that claim to slim you, I mean they really did slim, and that's impressive, but not every suit looks good on every person. So depending on what your problem area is or how the suit happens to fit. It's really important to try on the suit before you buy it."  So, hopefully, the next time you have to buy a bathing suit it's going to be a little less painful.           "