The word "dickies" can be used to describe a type of collarless shirt worn under a jacket or sweater. Synonyms for this word include mock turtlenecks, turtle-neck shirts, or mock neck undershirts. Some people also refer to these shirts as dickeys, dicky shirts, or shirt inserts. These types of shirts offer a sophisticated look without having to wear a full turtleneck or button-up shirt. Dickies can be dressed up or down, making them a versatile and practical addition to any wardrobe. With various styles available, including sleeveless, short-sleeve, and long-sleeve options, anyone can find a dickie that suits their taste.