Length: measure from the center of neck (backside), over point of shoulder,round elbow and down to the wrist.
Chest:Holding the tape firm and level, measure around the fullest part of the chest,just under the arms and around the shoulder blades.
Waist:With tape loose but level, measure at the height you prefer to wear your waistband.
Outseam: Measure from top of waistband to the bottom of the cuff.