A New York law firm is taking the “Casual Friday” idea and applying a charitable angle.

Lawyers and staff members at Anderson Kill & Olick are allowed to wear jeans on Fridays, if they make a small contribution to the firm’s ongoing fund-raising drive. Lawyers are charged $10 for the privilege each time they take advantage of it, other staff members $5, and interns $1.

Since starting the program in July 2008, the firm has raised more than $15,000 for three organizations: the American Cancer Society, City Harvest, and the National Parkinson Foundation.

“‘Doing Good Deeds With Denim’ adds a lovely twist to the bit of relaxation that comes with wearing comfortable clothes at week’s end,” says Ronni Meltzer, the firm’s director of human resources.