Kilt Apron with Leather button different from 1990.017.003. Used. Kilt Aprons (covers) were worn by Highland regiments on active service. Not only did the apron protect the kilt but it also made the kilt less conspicous in the field. It is a brown canvas apron with tape tie in a seam at the top, a single button flap pocket in the centre (actng as a sporran).