Definition of insecure. 1  1 : not confident or sure : uncertain feeling somewhat insecure of his reception. 2  2 : not adequately guarded or sustained : unsafe an insecure investment. 3  3 : not firmly fastened or fixed : shaky the hinge is loose and insecure.
For men, semi-formal attire means wearing a full suit, with vest optional. A tie, either bow or straight, should be worn, and the shirt should be a simple button down. Suit fabric choices are primarily wool gabardine or cashmere. However, a wool blend will do.
Dress codes. The dress codes counted as formal wear are the formal dress codes of white tie for evenings and morning dress for daytime. Although some consider black tie for the evening and strollers for daytime, as formal, they are semi-formal attires, sartorially speaking. The clothes dictated by these dress codes for women are ball gowns. For many uniforms, the official clothing is unisex. Examples of this are law court dress, academic and graduate dress, formal military uniforms and formal military evening dress.