1. Take a women's skirt with a simple design, with pockets, a knee length hemline, and
2. Do nothing stylistically with the skirt except size it up to fit men's body proportions
3. Sell it as a men's skirt. Not as a gender-neutral or unisex skirt, but as a clearly labeled men's skirt.
Because men's skirts are trying too hard to be something. They're either over-the-top masculine (utilikilts) or sold as gender-neutral. If you want men to actually wear skirts en masse, do what men's dress pants designers do. Men's dress pants are very similar to some of the simpler women's dress pants, only difference is men's dress pants are sized up to fit the male body.