This is a fundamental study to understand the cognitive decision-making process used to determine the appropriateness in the environment of clothes from the viewpoint of human engineering. We conducted a survey in which subjects were asked to give their impression of various office wear. We analyzed the results in order to systematize the subjective interpretation of the appropriateness of clothes design. We then used the survey to extract evaluation items by the extended evaluation grid method of the personal-construction theory and analyzed statistically the psychological constitutive decision-making process used to determine appropriateness. As a result, we could make an objective cognitive model for interpreting the appropriateness of the construction process of clothes design.