Is the current resurgence of retro-style swimwear hitting the mark, or will it flop? Spring runways were filled with high-waisted bottoms and demure tops to match, but who bought into the trend on the retail level?   The verdict comes down to a split decision. In the two-piece category, we see string bikinis far outnumbering their vintage-inspired counterparts. One-piece suits in these yesteryear styles, however, seem to be a more popular shape. Further, our insider buyer contacts report selling approximately one cover-up per suit, a telling and somewhat unexpected benchmark. Are we covering up more, and working out less?   No matter the questions that remain, if these head-turning, bathing beauty swim looks float your boat, we have a few recommendations to share.       JCP’s cute version by Allen B. ($42) is a safe, affordable way to dip your toe in the trend.                       A gingham check bikini by Seafolly ($128 top, $70 bottom) is lingerie-inspired, swapping the tricky high-waisted bottom for a hipster.                         Another trend we’re watching here at DFW Style Daily, the peplum, accents Betsey Johnson’s ‘40s-inspired polka dot bandeau suit ($180).                         A second two-piece from Seafolly ($86) features girlie frills, a floral print, and old-fashioned visible boning.                           Nanette Lepore kicks in with a curve-enhancing look ($86) splashed in red cherries. Very Betty Boop!                         Finally, Spanx millionaire genius Sara Blakely created this slimming, hip-hugging halter ($45) for her Target Assets line.                       (Photo credits, from top: 1. JCPenney.com, 2. NeimanMarcus.com, 3. Shop.Nordstrom.com, 4. EverythingButWater.com, 5. EverythingButWater.com, 6. Target.com)