When measuring for a jacket it is worthwhile wearing the type of shirt that will be worn with the jacket.

Use a flexible tape and measure around the fullest part of the chest. Stand straight but relaxed and try not to take a deep breath in or out as this will affect the chest measurement. Make sure the tape is straight across the back. Either ask someone to measure you or look in a mirror to check this. Don’t pull the tape tightly, and check the size on the tape. If your chest size falls between two sizes, order the size up if you like your jacket to be an easy fit.

The waist measurement should be taken at the navel (belly button) and please measure tightly.