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The swap was one of several events organised by Ms Brownlee and Matthew Schep, co-leaders of Students for Environmental Action Club, as part of the wider Enviro Week on campus, to make people more aware and get them to think about sustainability.
Using social media, they asked people to spring-clean their wardrobes and donate old and loved items of clothing for other people to choose for free - "to give them a new lease of life", Ms Brownlee said.
At the end of the " incredibly successful day", leftover garments were donated to the Salvation Army and the SPCA.
Also on yesterday's programme was a Zero Waste workshop with Sarah Tay of Pikaado giving people practical steps on how to cut down on waste and become environmentally aware.