This reminded me of all the hullabaloo from the TV censors back then, regarding her costume.
(Also, another tidbit, she was pregnant for the first 10 episodes, and they "hid" her pregnancy with a different, full-length top.)
(Excerpt below from Kiwireport, article by Stephanie Stevens, Feb. 6, 2017, about the harem pants) --
Remember those censorship rules we talked about? Well, if you remember never catching a glimpse of Barbara Eden’s belly button in her harem costume, then you can blame censorship regulations for that. Showing a little bit of skin was permitted in the 60’s (you know, free love and all) but there was something very specific about the belly button and its correlation with unbridled sexuality.