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.
Black Tie, White Tie, Formal, Semi-formal) How to Dress for a Formal Wedding in Daylight. Dressing for a formal day wedding is the most casual of the formal weddings, but still formal. Men can wear lighter suits, (grays and pinstripes) but should still wear a tie. How to Dress for a Formal Wedding at Night. This category is when the wedding invitation details really come in to play.