Tammy was a knock-off Barbie, I realize now. I always felt sorry for Tammy because she had only about half the wardrobe Barbie had. Tammy was a little bigger than Barbie, so Barbie could wear Tammy's clothes and look really great, but Tammy couldn't borrow Barbie's.
I don't know where Ken was at that point. Maybe his hairdresser's?