Larkspur Plaid Flannel Longsleeve Buttondown ShirtDescription Made with dense three ply organic cotton yarn, the Larkspur Flannel Shirt takes a classic button down collared shirt and makes it a cold weather must. Double brushed plaid makes for a shirt that's cozy inside and out. As soft and comfortable as it is durable, it features branded Vans details like a chest patch pocket and woven label at the hem.