There are two main reasons:
1. A women Sweater weighs less. To be more specific to make one Men Cashmere Sweater it take about 300 grams of fine Cashmere. Since the 1kg of high-quality Cashmere from Inner Mongolia costs alone 150€/kg this makes up a significant amount of the difference.
2. Since they weigh less they require less time in the production process (i.e. knitting, controlling for quality and so on).
This means that women Sweaters cost significantly less to make. Nonetheless, we apply the same markup of about 45% on the early bird prices for both men and women Sweaters,