There are several synonyms for the term "overseas cap," which is a type of military hat worn by soldiers serving overseas. Some of the common synonyms include garrison cap, campaign cap, utility cap, and field cap. The caps are typically made of wool or cotton and are often designed with a stiff brim and a flat top. They can be worn in both formal and informal military settings, and they offer protection from the elements while on duty. The term "overseas cap" has been used for many years, but soldiers and military personnel often use the other synonyms to refer to this practical and functional headwear.