 SPOILER: When Ennis finds Jacks and his shirts hanging together in  Jacks childhood closet, Jack has arranged them so that Jacks blue  shirt is visible first and Ennis light plaid shirt is tucked inside  it. In a later scene, after Ennis has taken both shirts home to hang  them in his own closet, they are reversed, so that Jacks shirt is  inside Ennis. According to co