Form fitting

Given a circumscribed rectangle, two fashion models transform to one mathematical model. It is seen to be general.

Alice B. Toklas and Gertrude Stein, 1936, by Cecil Beaton. https://a.1stdibscdn.com/cecil-beaton-photography-alice-b-toklas-and-gertrude-stein-1936-portrait-photography-for-sale/a_88/a_62377221590665127114/32_HM0212_IMAGE_master.jpg?width=1500