The t-shirt could be a gem - what tag is it? the sweatshirt, I agree...looks far too Ed Hardy-ish to be from the 70s/80s?
Jimmy J
(Please note: Legit checks I do in this forum should not be considered 100% conclusive; I'm simply giving a gut reaction based on the limited information provided.)
Sorry to be the bearer of bad news zam143, but both of these items are recent reproductions.
The t-shirt has "1978 DT Designs, Inc." included as part of the graphic because it was part of the original artwork back in '78 and the current Dogtown manufacturer doesn't want to be sued for copyright infringement.