There were several series featuring T-Bag, and her trusty sidekick T-shirt. In each series a child, usually a girl, referred to as Polly-Peewee Perfect Pants or somesuch by the hapless T-Bag, would have to collect something: musical notes, silver spoons, missing letters of the alphabet, etc.
There were actually two acresses who played the part of T-Bag: A brunette with a Yorkshire (I think) accent, who is presumably the one now in Emmerdale (which I don't watch), and an American with silvery-blonde hair, who was by FAR the better T-Bag.
check out this link for FAR more information than I could give you about the series':
http://members.lycos.co.uk/jrv94/