Mulan's poem describes how Mulan restored her daughter's clothes after her triumphant return.

Hearing the news of my daughter, I went out to help Guo; As soon as Sister A heard that Sister Mei was coming, she had to cut her red makeup. When I heard my sister coming, I sharpened my knife at pigs and sheep. Open my East Pavilion door, sit on my West Pavilion bed, take off my wartime robe, wear my old clothes, arrange clouds and temples as windows, and apply decals to the mirror. When I went out to meet the fire companions, I was both surprised and busy: I spent twelve years together, but I didn't know Mulan was a girl.

If you want to refer to it specifically, it should be "the window is in the clouds and the mirror is in the dead."