Mishnah 7 in the first chapter of Maseches Sotah continues with the subject of the sotah's disgrace, but it explains that this disgrace is not arbitrary. It rests on a fundamental principle: measure for measure.
"B'middah she'adam moded bah, modedin lo" - this is the rule the Mishnah establishes: the Holy One, blessed is He, punishes a person according to his deeds, with the very same instruments and in the very same measure that he himself used.
Measure for measure in the sotah's disgrace:
"Hi kishtah es atzmah la'aveirah" - she adorned herself and made herself attractive for the sake of the adultery, and therefore the Holy One, blessed is He, makes her repulsive and shames her.
"Hi gilsah es atzmah la'aveirah" - she uncovered and exposed herself in the course of the sin, and therefore the Holy One, blessed is He, exposes her in a shameful manner.
The order in which the limbs are struck:
The same principle determines the order of the punishment as well. The thigh is what began the sin, and from there, in the act of adultery itself, it spread to the belly. Therefore, as we will see further on in the punishment itself, if she is guilty, the thigh is struck first, and after it the belly, and the rest of the body does not escape either.
In summary: This Mishnah teaches that the sotah's disgrace flows from the rule of "B'middah she'adam moded bah, modedin lo" - her adornment leads to her degradation, her exposure leads to the exposure of her shame, and the order of the limbs with which the sin began is the order in which the punishment strikes: from the thigh to the belly, and on to the entire rest of the body.