Every fall, there’s one wardrobe staple that quietly takes over, and this year it’s undeniably the plaid button-down shirt. Instead of feeling rugged or overly casual, the newest versions are softer, more oversized and intentionally styled, making them feel just as polished as a classic Oxford shirt. They add texture, warmth and just the right amount of effortless cool to almost any outfit. Fashion insiders are wearing plaid shirts far beyond the traditional jeans-and-boots formula. Think draped over the shoulders like a sweater, tied around the waist with tailored shorts, layered over tanks,...