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I haven't found a vintage clothing shop in Geneva. There are some charity shops about http://www.csp.ch/page.asp?np=1&id=21 gives you the location of some of them.
There is a quite funky 2nd hand clothing shop in the Paquis (the area between the train station and the lake).
There are a few in Eaux Vives (the side of the lake where the jet d'eau is) but the clothes places I have seen there have either been very ordinary, or very expensive second hand designer gear.
The weekend market in Plain Palais sometimes has clothing stands, but nothing very exciting that I have seen.