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.
Where semi-formal is a step down from formal, semi-casual is a step up from casual.kirt or dresses for women is allowed. Button-down dress shirts, sweaters or polo shirts are great for men and women. Men may also wear a necktie but for semi-casual it s not expected. For a casual affair such as church, dinner at a friend s home, yachting or casual dining, a nice jacket or sweater for men is best.