The frock coat is a formal/semi-formal jacket that reached the height of popularity in the late 19th century. It was usually tailored to fall as low as the knees, suppressing at the hips and cascading from there. Due to the variety of its implementations, the particular stylings of the frock coat are difficult to detail; military frocks were often navy blue and double-breasted, with copper buttons; winter frocks were often black or charcoal, and had only insubstantial notch collars, buttoning almost to the throat. The only certain characteristic of a frock is its length and general Western martial cut. The frock coat was almost entirely lost to history by the turn into the 20th century, and now they are only used as costume pieces and novelty regalia.