Length: Measure down the centre of the back, from the top edge of the garment to the hem

Shoulder width: From shoulder point to shoulder point, across the back

Bust: Measure across the garment, in line with the under-arm seam, and double the figure

Waist: Measure across the garment, in line with your natural waistline, and double the figure 

Sleeve length: Measure in a straight line, from the centre of the back to the point of the shoulder, then from the tip of the shoulder to the cuff and combine the measurements