I. Louis Firestone, 85, a Washington artist and former proprietor of women's clothing shops, died of penumonia Wednesday at the National Institutes of Health.

He had lived in the area since the early 1930s. His oils and watercolors had been exhibited at the Smithsonian Institution, the Rockville Civic Center, Arena Stage and the B'nai B'rith gallery in Washington.

Mr. Firestone also had contributed portraits to The Washington Post.

He was a member of the Landscape Club and the American Art League of Washington. He belonged to Adas Israel Congregation in Washington for 47 years.

He owned four Firestone Fashion Shops in Northwest Washington for about 20 years before retiring from the business in the mid-1960s.

Mr. Firestone was born in Hungary and moved to Pittsburgh at the age of 11. He was a graduate of Carnegie-Mellon University's School of Design, and taught art in Pittsburgh before moving to New York City about 1910.

He attended the New York School of Industrial Art and was a student at the Art Students League. He did theatrical posters, caricatures, portraits and woodcuts for New York theatrical productions. He also contributted caricatures of theatrial personalities to New York newspapers.

Mr. Firestone donated much of the work he did in New York to the Museum of the City of New York.

He is survived by his wife, Ray, of the home in Chevy Chase; a son, Ross, of New York City, and one grandchild.