The best thing to wear with your Birkenstocks this week? A pair of sheer, polka-dot ankle socks by Falke in cotton candy pink  or cobalt blue). Falke, if you remember, is the luxury hosiery brand that designs tights which make your legs so silky smooth, you're in danger of wanting to leave the house without a skirt. With these juicy pop socks, they may have just found a way to lift your mood too. Spring-in-your-step-status guaranteed.