noun.
The part of a garment, such as a coat or jacket, that is an extension of the collar and folds back against the breast.
The Century Dictionary and Cyclopedia
noun.
A part of a garment which laps over another part, or which is turned over and folded back, either permanent or adjustable, as for buttoning and unbuttoning.
the GNU version of the Collaborative International Dictionary of English
noun.
That part of a garment which is turned back; specifically, the lap, or fold, of the front of a coat in continuation of collar.