Double-breasted
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In clothing, double-breasted refers to a coat or jacket or similar garment having a very wide overlap in the front and, usually, two parallel columns of buttons or snaps. (By contrast a single-breasted coat has a narrower overlap and one column of buttons.) In most cases one column of buttons is simply decorative. Only those at the outer edge of the overlap actually fasten the two layers together. The others, placed on the outside of the outer layer, either serve no purpose or allow the overlap to be reversible.
Pea coats and some trench coats are traditionally double-breasted.

