As a naked mole rat, Miki prefers not wearing clothes. When she is forced to wear them during interactions with other students, she feels incredibly embarrassed and mortified to the point that she sees the other students as having their clothes pixelated over. Though she is normally comfortable with being naked, it only limited to being in her underwear, for being totally nude actually embarrasses her.

(Source: Murenase! Seton Gakuen Wiki)