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A frock coat (also: Prince Albert frock) is a man's coat characterised by knee-length skirts all around the base, unlike the tail coat and the morning coat. The frock coat is fitted, long-sleeved, of knee-length, with a collar and lapels (revers), a centre vent, and a waist seam for optimal waist suppression. As formal wear the frock coat always is double-breasted with peaked lapels. As informal wear, the single-breasted frock coat often sported the notched lapel (hence its informality), and was more common in the early nineteenth century than the formal model.