Boiler suits, Coveralls or Overalls are designed to be worn over everyday clothes to protect the wearer from dirt and grime and offering protection from certain hazards in the workplace. When choosing a boiler suit the size stated is the chest size and allows a few extra inches for clothes to be worn under the boilersuit. If you are a 38" chest size order a 38" boilersuit as it will be sized to allow for undergarments. We also have styles available in tall and long leg as well as a regular length.