1.Shoulder lentgh from center body: Measure from the center of the back neckline, follow along the garment's shoulder to the armhole seam. Pivot at the shoulder/armhole junction, then extend along the sleeve's center to the sleeve edge.
2.Chest width: Measure from the bottom of one armhole across the chest to the bottom of the opposite armhole.
3.Length: Place the measuring tape in the middle of the collar and pull it down vertically to the bottom of the jacket.
4.Hem: Measure from the end of tape measure on the outer edge of the hem. Run it along the width of the garment to the other edge.
Sizes can vary from 2-3 centimeters because they are measured by hand. 1inch=2.54cm.