Original unworn official Frankie Howerd "Frankie Says" "Titter Ye Not " T-shirt from the 1990s. Official Tiiterwear. I distributed these shirts to HMV, Virgin etc in the 1990s, having done a deal with the great man himself (well, his manager/partner) when he was touring Universities.
This was a sample from my old office, been bagged up in my loft for decades. Unworn but i have washed it a couple of times over the years. Shirt and print like new apart from the neck label has faded
White tee with front(Tiiter Ye Not), back(Frankie Says)  as in the photos. 
Size is XL Measures 25" armpit to armpit, chest 50"