I will wear a kilt to work on Halloween, as I work at a childrens hospital and we all have a costume/dressup day. I would not consider wearing it, along with appropriate daywear attire, as being a costume, anymore than I would if I wore cowboy boots, jeans and a stetson or a full out tuxedo that day to work. These are clothes that I might wear in a more appropriate situation where they would not be considered a costume, so why should they be considered one just becasue it is Halloween. Wearing my kilt that day will be another opportunity to show folks that a kilt can be worn anyday, and look great, even if it is Halloween.