I'm surprised they are only doing men's clothing. There seem to be far less men willing to pay for well made or high end clothing than women even though (from my experience), they tend to wear the same clothes longer.
Then again, even I don't really understand the quality difference of clothes made at discount places. How long will an Old Navy sweatshirt last? Or pants?
Women don't care as much about quality because they're more concerned about fashion. There's no point in buying something that will last 15 years if it'll be out of style next year. Thus, the more successful approach right now is that of very up to date fashions combined with mediocre quality and sold at an affordable price. This is what Zara is doing so well and why its founder is one of the richest men in the world. Other examples are H&M and Forever 21.
Then again, even I don't really understand the quality difference of clothes made at discount places. How long will an Old Navy sweatshirt last? Or pants?