I'm with Robin
He/she was nervous. He tryes to refresh himself to regain calm. "Necesito aire para que se me vaya el susto", meaning I need air (I need to breathe) to keep the fright away (to be calm again)
The start, with the "camisa", it's only one of multiple way to "have air"
another example:
"dame con el abanico para que con el aire se me vaya el susto"
"voy a salir fuera a ver si con el aire se me pasa el susto"
Saludos