Chest: The suit size is to fit the chest measurement as shown. Measure around the fullest part of your chest (the full circumference, keeping the tape well up under your arms and across the shoulder blades.
Length: This is the length of the suit down the centre of the back from the nape of the neck to the hem.
Waist: Measure around your waist (over your shirt, not over your trousers) at the position where you normally wear your trousers. Keep the tape a bit loose, so it is comfortable.
Inner Leg:
Measure along the inner leg seam of a pair of tailored trousers that you feel comfortable. The trouser hem should be about 6cm below the ankle bone. All trousers have a 6cm turnup and 8cm back seam inlay, so alteration (if necessary) is quite straight forward.
All trousers have the same fit, and they are all regular in length.