Last summer, Sigerson Morrison had shoppers lining up around the block for its $85 breakthrough in sandal technology: rubber flip-flops with a heel. This spring, you can pick up Mossimo knockoffs in black, white, and pink for $12.99 at Target. Blurring the boundaries between casual and classic, they’re the perfect accompaniment to that flirty dress you bought for warm summer nights, and easier to walk in than most other heels. At Target stores nationwide (target.com or 800-800-8800).