How to Even Out Tan Lines for your Wedding: 4 Easy Ways Swim suit to prevent tan lines? One of the most asked questions since the wedding, what tan did I use?, I was genuinely so stressed about tan transferring onto the dress, especially because it was strapless, but this one did NOT Brides, with warmer days ahead, be mindful of tan lines before your big day! Opt for strapless while sunning if your dress is strapless and always wear SPF.