I wear a kilt to work everyday, however I leave my UK and my Union kilt at home and wear the tartan kilts instead, however if that is the kilt you have then wear it. My only advise is that you should make sure that your overall appearance is neat and tidy, it will help you to be able to wear it the next time you want to. Perhaps you could post a picture of what you were thinking of wearing with the kilt, I'm sure you will get many suggestions, and opinions if you do. The really good thing is that your supervisor has given you the green light, that can be tricky, so you are more than halfway there.