A dickey is a type of false shirt-front - originally known as a detachable bosom - These Detatchable Half Shirt Blouse Collar Dickies offer a crisp, clean look to dress up a sweater, oversized blouse, uniform, dress, cardigan, shirt, etc. The blouse portion is made of 100% cotton and the collar is made of 100% polyester so that the collar maintains its shape and also to prevent the blouse from becoming too stiff. The elastic keeps it snug on your body and it's flexible enough to fit most sizes. One size fits all!