Men, this is the measurement you use for dress shirts. Start at the back of your neck, at the spine. Extend your arm, slightly bent. Measure down the outside of your arm to the ball of your wrist.
This is the measurement you usually use for trousers. Measure around your waist where you normally wear a belt.
Waist to Ankle
Begin your measurement from the top of where you wear your belt. Measure down the outside of your leg to the outside of your ankle -- to the ball of your ankle.
Neck to Waist
Start at the nape of your neck, from the bottom of your shirt collar. Measure down your back to your waist at your belt.
Supply all measurements in inches please.