The T-Room
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Tabatha Bag's travelling costume
 

This costume featured in episode 1 of "Pearls of Wisdom", and is the costume Georgina Hale is wearing the first time we see her. Not sure what it is made from, but I would hazard a guess that the jacket is cotton velvet. Interestingly, the sketch shows the skirt being made from black cotton, when in the actual show, the skirt was a white and blue chequered pattern.