What you need to know this instant.

Shop the Trend: Railroad Stripes

Remember railroad stripes, those closely-placed, utilitarian lines that covered the Oshkosh B'gosh overalls and Gymboree jumpers you wore as a little kid? Well, they're back with a vengeance for Spring 2013.

At Rag & Bone, where we noticed the first signs of an emerging trendlet, the densely-placed stripes covered flouncy little sundresses and layered blazers. Then, at Altuzarra, we spotted them on neatly-pressed oxford shirts and V-neck dresses. At Suno, they popped up on exposed shirttails and city shorts. And Tommy Hilfiger used them to preppy effect on his pajama-style suits and separates.

Click through to peep our favorite examples of railroad stripes on the runway—and to shop the trend long before these clothes hit stores.

Keep up with the Lucky team on Twitter: