@Megan64; I think of Dr. Jelly as being two shades of either turquoise or green (with some grey to mute the hue). Since I was alive and young and hip in the 60’s, I can’t bring to mind what color blue you are thinking of. The tie-dyed T’s used a brilliant cobalt. I may still have one as a rag somewhere.
At the bank last week, I got several compliments on the shirt. If only Dr. J were wearing bifocals, he’d be perfect.