WASHINGTON, Oct 4 (Reuters) - New orders for U.S.-made goods accelerated in August, pointing to sustained strength in manufacturing even as economic growth appeared to have slowed in the third quarter because of shortages of raw materials and labor. The Commerce Department said on Monday that factory orders increased 1.2% in August after rising 0.7% in July. Economists polled by Reuters had forecast factory orders gaining 1.0%. (Reporting By Lucia Mutikani) Our Standards: The Thomson Reuters Trust Principles.