This is custom lettering. It would take a very intelligent font -- or one with many ligatures -- to have different connections for each of these letter pairs.

Thanks. I had the feeling it was a custom font but I had my fingers cross it wasn't.

"A designers most important tool is his brain and his most important skill is using it" -Ian Anderson of tDR

I bought that shirt about two years back,
the design got real old real fast.

Definitely custom made.