There are two things to know about attending this weekend’s Project Red Dress party: 1. You have to wear a dress. 2. It must be red.

Those are the ground rules. How you achieve them is entirely up to you.

The Sin Sity Sisters’ annual red dress parties have featured everything from traditional southern belle gowns, miniskirts and cheerleading outfits to cocktail dresses and even a Catholic cassock.

Jim McCoy of Bearded Lady Burlesque says he recycles materials and uses thrift store finds for his dresses. The winner for best dress at last year’s Cherry Poppin’ Red Dress party used sequined cherry ornaments bought at a post-holiday discount for the outfit’s headpiece.

Jeremy Oates (aka Ali Kat) hits the fabric district in LA to find material for his gowns and incorporates everyday items into his fashions. The makeup artist, performer and costume designer has even used a hula hoop to create a giant feathered collar, jutting skyward from the back of a form-fitting dress.

To men who aren’t comfortable in formal gowns, he suggests a miniskirt and tank top.

More than 800 men and women attended last year’s event at the World Market Center, says Mother Loosey, founder of the Sin Sity Sisters of Perpetual Indulgence, a nun-like ministry that holds the event to raise funds for its Sisters AIDS Drug Assistance Program (SADAP).

So alter a sheet, spend billions on a diamond-encrusted gown, hit the department store racks or head to Savers for a ridiculously ’80s prom dress. Just make sure it’s red.