How do I work out my size?

Sizing guides on the suppliers websites usually give a chest measurement and a length measurement for the polos and tees. This measurement is usually a 'half-chest' measurement and looks something like this:

They are referring to a half chest measurement of the actual shirt not your body. The easiest way to work this out is to take a shirt from your existing wardrobe that is a similar style and fits you well. Lay the shirt flat on a table and measure the width of the shirt from 2cm below the underarm seam. Compare this number to the number in the sizing chart to find the closest fit. The SP length in the sizing chart seen above is the 'shoulder point' length. Again the shirt is laid flat and the length is measured from the highest point, which is where the shoulder seam meets the neck, down to the hem of the shirt. Some sizing chart refers to CB or centre back length which is the length from the centre of the neck hole at the back to the hem of the shirt.