You may not recall your dorky date’s name, or the song you awkwardly slow-danced to.

But you remember your prom dress like it was yesterday. That strapless, iridescent-purple Jessica McClintock with the three ruffles on the bottom still occupies a page in your mental scrapbook.

Help create such memories for others. The Princess Project, a 100-percent volunteer effort, provides free prom dresses and accessories to Bay Area girls who can’t afford them. Gather up all of your new and nearly new formal dresses (now’s the time to rid yourself of that bridesmaid garb), handbags, jewelry, and shawls. (No shoes or dirty garments, please.) Then, bring your cast-offs to Anthropologie (locations in San Francisco, Palo Alto, San Jose, and Berkeley) through March 19.

You’ll get a tax-deduction — and a warm and fuzzy feeling — for your do-gooding. Volunteer again on April 2nd or 9th, and you can help the Princess Project’s beneficiaries pick out their frocks.

Then they’re off like a prom dress.

The Princess Project (415-269-6667 or princessproject.org).