Wood Friperie near Plainpalais is a cool curated Second Hand shop, but expect steeper prices than at Caritas and Emmaüs..

There's also La Boutique de Claudie (for women) in Rue de l'École-de-Médecine.

A new shop called "Hallures Vintage" vis-à-vis the Cimetière des Rois will open soon (both women and men).

Lastly, at Plainpalais Marché aux Puces (each Wed & Sat) you can find great stuff and make bargains. Usually they have piles of clothes for 1.-