When I was queuing to get into the Great British Beer Festival (GBBF) in London last August my mate (not a CAMRA Member) remarked "you can tell who the CAMRA guys are - going bald, grey beards, paunches and beer related T Shirts" Spot on.
On the subject of T shirts, the other week I was volunteer at the Sunderland Beer Festival and acquired another festival T shirt, well actually a Polo Shirt. That's 7 now. However they are not the first.

I am pleased that they are all XL and have therefore not increased much in size and they all fit ; although the light blue one ( 2013 ) has shrunk a bit and so reveals too much overhang when I raise my arms.

I submitted it for a CAMRA photo competition soon after the festival ; Came back the reply - "well its not what we are looking for!"
No sense of humour !