Sotah chapter 1, Mishnah 6. This Mishnah continues to describe the further means of degradation and humiliation employed with the sotah before she is given the bitter water to drink.
Degrading her clothing and jewelry:
"Haysah mechusah levanim - mechaseh shechorim" - if she is dressed in white garments, she is covered in black garments instead.
"Hayah alehah kli zahav - ma'avirin mimenah" - necklaces, earrings, nose rings and the rings on her fingers are all removed from her, so that she will not appear attractive.
All of this is done with a single purpose: that she should look ugly and lowly.
The Egyptian rope:
Afterward an Egyptian rope is taken, a very coarse rope, and it is tied above her breasts. Its function is to make sure that her garments, which have already been torn, do not fall off her entirely.
Who may come to see her?
Anyone who wishes to come and see her may come and view her in her disgrace, except for her male and female servants. The reason: she is close to them, and their gaze is liable to give her emotional strength, whereas the entire purpose is to bring her to a state of lowliness so that she will admit to the adultery, and we will not need to erase the name of Hashem into the water.
"V'chol hanashim mutaros lir'osah":
The plain meaning of the wording is that they are permitted to see her, but two approaches are offered in explaining it:
The Gemara explains that this is not merely permission but an obligation: the women are required to see her, and they in particular must take note of her.
Some explain that "mutaros" does not come from the word for permission, but from the word for warning and admonition: through seeing her, they are being warned.
And as the verse states, all the women should take a lesson and a moral from this, and not act as she did in her licentiousness and adultery.
In summary: in this Mishnah we learned the continuation of the order of the sotah's degradation - exchanging white garments for black, removing her gold jewelry, tying an Egyptian rope above her breasts, and permitting everyone to view her except for her male and female servants - all in order to bring her to a state of lowliness that will cause her to admit the truth, as well as the two ways of understanding "v'chol hanashim mutaros lir'osah": an obligation to see her, or an expression of warning and admonition, through which all the women will take a moral lesson.