I don't get why you would have trouble with your military coworkers if you wear a kilt...specially given that the kilt was/is used by actual combat units.

I specially don't see the problem when so many active service mil types wear kilts as well, I guess im trying to say I think you're making a bigger deal than necessary, simply wear your kilt and be done with it.

If they get out of line with their ribbing, they are the ones that will be disciplined, so...go for it and don't overthink it.