Answer:Reference group
Explanation:
Reference group is the group of people who are used for comparing with other group or person.They are considered as the reference for other communities in the form of standard so that the other group and assess about their own group in terms of behavior and performance.
According to the question, dressing style of Diego is based on the reference group which is adapted by comparing and evaluating himself with associate's dressing style of the consulting firm .This is done by him to create a good impact on superiors.
