The first time I wore a kilt was as a costume for Halloween 2001, as "Braveheart." My neighbor was a costumer and made the Kilt for her teen son to wear to RenFair.

If I had not felt so comfortable that weekend, I would not have gone on to buy 5 kilts. Halloween got me into Kilts (literally and figuratively).

Another year, the same Neighbor's son wore his Kilt and a Darth Vader mask for Halloween. "Darth Wallace." (ouch)

Last year I went to a party as a demon with horns, and a tail protruding from below my Kilt. Sure I could have used pants, but the effect with a kilt was much better.

So if the kilt works with a costume - go for it.

For me, Halloween is also a celebration of 7 years of kilted living.