Railroad stripes bring back memories of adolescence, but those are soon to be replaced. The classic, utilitarian stripe has been showing up again and again, and not just on your typical denim jeans (or overalls, as we remember them from childhood). A smart jacket from Rag & Bone, an a-line skirt from Ruffian or flouncy dress from Jenni Kayne are just a few of the offerings from designers this week.