"the Gibson Girl type of beauty"
One of Charles Gibson's pen and ink drawings
Public DomainOne of Charles Gibson's pen and ink drawings

The "Gibson Girl" takes her name from the illustrator Charles Gibson, whose drawings of women set the fashionable ideal in the late 19th and early 20th century in the USA. 

Camille Clifford, an ideal of
Public DomainCamille Clifford, an ideal of "Gibson Girl" style

The Gibson Girl style included hourglass curves, narrow waists, tall stature and hair piled on top of the head.  The Gibson Girl character was independent (by the standards of the time), lively and youthful.