How to measure the shoulder width of a small suit with shoulder pads?

Lay it flat on the bed and measure your bust, shoulder width, and waist. Bust measurement is the widest distance between the armpits on both sides of the garment multiplied by two.

Shoulder width is the distance between the shoulders on both sides, just lay it flat to measure

Waist circumference is the distance between the thinnest parts of the waist multiplied by two

Taobao store: Rouge show small suit with shoulder pads