Abstract: A garment to be worn by a person has a first fabric panel having a first side edge and a second fabric panel having a second side edge. The first and second panels are joined by stitching to form a seam near the first and second side edges. An aperture is formed between the fabric panels by an interruption in the stitching. The aperture may be formed directly on the garment, or may be provided as a set-in that is attached to the garment. The aperture may be positioned on the garment so that it will be located under the arm of a person wearing the garment.