I wear my clan insignia several days a week, but I'm going the next step and getting the sash. The people I've talked to always discourage women from wearing a kilt.
On a happier note, one of the parts that I've admired about the wearing of the plaid is that a woman can wear either her tartan or her husband's tartan.
And why oh why don't more men realize how sexy a man in a kilt truly is?!