Box pleat

The box pleat is a symmetrical pleat in which two folds point outward from the centre, while the reverse forms a so-called inverted pleat. Seen from the front a 'box' of extra fabric is created that provides freedom of movement and adds volume to the garment.

On shirts the box pleat is typically centred on the back panel, directly below the yoke. It runs about 3 to 5 cm wide over the full back length or at least over the shoulder area. On skirts and kilts box pleats are characteristic of the silhouette, on jackets they appear as centre back vents.

Structurally the box pleat is fixed with two outward-facing folds before joining and then stitched. The pleat drapes in an arc when worn and allows the typical elastic width.

On business shirts the box pleat on the back is regarded as typically American – it provides extra fit comfort and a slightly sporty look. Classical European shirts usually omit it or have two smaller side pleats instead. On sport shirts, hunting shirts and military shirts the box pleat is standard because it allows extra freedom of movement in the shoulder area.