The context of the following conversation is After Addison checked their clothes in the mirror, they realized that their pants had a large hole in the back.:
Addison says Oh my goodness I almost left the house half dressed today..
The friend responds What happened to you?.
Addison responds I had these pants I hadn't worn in forever and didn't know it but they had a huge hole in back..
The friend responds You didn't notice it before dressing?.
Addison responds No. I was checking in the mirror and saw it and changed..
The friend responds Thank goodness you thought to turn around in the mirror..