Time Out says
Thrifters, cheapskates and anyone else on the hunt for a new wardrobe without spending a penny, this one is for you. This Clothes Swap is being run by The Clothes Club to raise money for the Bootstrap Company - the enterprise that runs the Dalston Rooftop, a local gem of a venue. How it works is you bring up to three pieces of clothing (that you are proud to pass on of course) and swap them for someone else's items. Et voila! New clothes.
And - if you e-mail the organizers by Aug 23 (email@example.com) describing an item you'll bring to the swap and a story behind it, you could win free entry and three clothes tokens.
Buy your tickets here: http://billetto.co.uk/theclothesclubuk