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We examine the effectiveness of gender reforms in increasing women's representation in selected offices. We generate exogenous variations in representation at the Italian regional and municipal elections using the passage of two gender reforms: i) party-list gender quotas, a supply-side reform intended to influence party decisions regarding candidacy, and ii) double-gender preference systems, a demand-side reform intended to influence voting decisions on candidates. We show that party-list gender quotas have no effect on the likelihood of women winning a seat, whereas double-gender preference systems are effective in increasing women's representation. Furthermore, we provide evidence that supply-side reforms are susceptible to party-list manipulations, which undermine their effectiveness. In constituencies with a stronger voter gender bias, supply-side reforms may also unintentionally have a negative impact on women's representation in leadership positions.