Gladys Nilsson (born May 6, 1940) is a contemporary American artist known for watercolors and collages.
Biography on National Gallery of Art:
https://www.nga.gov/features/exhibitions/outliers-and-american-vanguard-artist-biographies/gladys-nilsson.html

Pink Suit #2 by Gladys Nilsson
1966 / Watercolor, over graphite on paper / 16-1/10″x10-1/10″ / Art Institute of Chicago, IL

Gladys Nilsson on Artnet: http://www.artnet.com/artists/gladys-nilsson/

Further reading:
https://www.interviewmagazine.com/art/gladys-nilsson-retrospective-honk-matthew-marks-garth-greenan-hairy-who
https://www.frieze.com/article/gladys-nilsson-older-i-get-bigger-i-want-these-women-be
https://interactive.wttw.com/art-design-chicago/hairy-who