concert tour shirt xl used rock.  This T-shirt has the Rush logo and Tour 1978 on the front.  I do not know anything about the origin of this shirt, so I don't presume it is from 1978.  There is no size ticket or markings of maker (there is a tag on an inseam but it is faded, but it fits like an XL and is soft black t-shirt feel.  There is nothing on the back.  Seams appear to be double stiched