Everybody knows what a grid girl is. They are present in every motor racing or such kind of competition. They are also known as race queens or pit babes. In United States they are referred as umbrella girls.
These girls were first used in 1967. Before there were only drivers' wives or girlfriends present in races. In 1983 in France - 24 Hours Le Mans competition - and 1984 in Japan - Suzuka 8 Hours motorcycle competition - the sun cream company "Hawaian Tropic" used some models wearing bikini with the name of the company printed on.
Nowadays they can be found in automobile shows, too and they have a dedicated magazine called "Gals Paradise". You may find some interesting pictures here .