It's modern, hip, and progressive for women to wear men's clothing -- including kilts. I think many of us are concerned that women wearing kilts makes it that much harder to convince important others (spouses, bosses, etc.) that kilts are men's clothing.

Then there are the cultural purists who'd rather see a (Celtic) woman in a kilt than a man who isn't of that heritage.

My own opinion is leaning towards, "People should just wear what they like. The rest will sort itself out."