To efficiently produce a wear by simulating the wearing state of a wear with a computer based on the body form data, etc., of a wearing person, displaying the simulation result, confirming the wearing state of the wear on the computer screen and producing or correcting a dress pattern fitting with the body form.

The wearing state of a wear is simulated with a computer based on the form data of the cloth parts, the property data of the material and the body form data of a wearing person, and the result is displayed. Preferably, the final decision of the shape or material of the part of the wear is made based on the simulation result, parts are prepared based on the finally decided condition of the parts and the objective wear is produced with the parts.