In 1895, the Labour politician Keir Hardie was booed in the House of Commons for wearing a cap on his campaign poster. Those times are now long gone with politicians, especially in the US, taking full advantage of this accessory for promotional purposes. Jimmy Carter, and more recently Donald Trump, have skilfully used this object to assert their local roots or to bear their campaign slogan. In terms of political marketing, personalising a cap and other forms of textile merchandise make it possible to bring together members and supporters of a movement around a message and a visual identity and to strengthen their sense of belonging. A uniform clothing strategy conveys the image of a strong vision and a solid and committed electorate, increasing group cohesion and the awareness of a candidate. When worn by the leaders and members of a political party, a personalised cap is a powerful communication tool. When given out during a meeting or in the street, it evolves within the circles of activists and the public whom he meets to spread ideas and his campaign program. As a merchandising product, it can also be sold, generating income. A very popular fashion accessory, worn by both women and men, by both children and adults, the personalised cap therefore represents an excellent dynamic promotional tool for electoral events and political meetings.