An arm sling and method of making an arm sling including an open ended arm receiving tube supported on a patient's neck via a neck strap. The tube includes a forward end portion with an open front end of predetermined size and a rear end portion having an elbow receiving pocket adjacent an enlarged diameter rear opening. The arm receiving tube is formed from a single sheet of pliable fabric and includes first and second elongate opposing substantially identical side wall panels each having upper and lower edges spanning front and rear edges which form the front and rear openings. Each lower edge includes a front lower edge portion longer than the upper edge and a rear lower edge portion which is shorter than the upper edge. The rear lower edge portion is upwardly inclined relative to the front lower edge and has a rear end terminating in the lower end of the rear edge.