I read that in the original Get Smart series Feldon's hair was so baby-fine she wore a wig. Does anyone know if this is true?

Yes, she did indeed wear a wig. In fact, she had many, for all the different styles.

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Yes I think she did because i saw episode 12 and she had long hair and then in episode 13 it was above her ears! not unless she got it cut okk you are stupied jessica !