Each product has size chart displayed in product gallery images. Please refer those size charts.
Shoulder
Shoulder measurements are obtained by measuring across the shoulders, seam to seam.
Length
Length measurements are obtained by measuring the length of the top from the top of the shoulder, at the collar, to the hemline.
Chaist
It is measured across the chaist with the garment lying flat. The measurement is taken from side to side. This is then doubled to provide a measurement of Waist.
Waist
It is measured across the waistline with the garment lying flat. The measurement is taken from side to side directly at the waistline. This is then doubled to provide a measurement of Waist.
Following figures shows how measurements are taken.