For women:

Whether you’re a businesswoman who constantly updates her wardrobe or a former corporate drone who’s scorned her professional wear in favor of jeans and t-shirts, you may have some perfectly usable suits kicking around. You can donate those to women who are looking for a job through Dress for Success. They have numerous locations throughout the world and are accepting interview appropriate skirt and pantsuits, blouses, blazers and professional shoes. They are particularly in need of larger size suits.

You can also try the Women’s Alliance, which has multiple chapters.

California (northern), multiple locations: Wardrobe for Opportunity

Massachusetts, Malden: Tailored for Success

Washington, D.C.: Suited for Change

Taking both women’s and men’s professional clothes:

For men:

Multiple Locations:  Career Gear