A military uniform has two basic characters. One is functionality for field warfare and the other is decorativeness to express dignity and power to maintain systematic organization. For these purposes, the military uniform is maximizing its effects on functionality and decorativeness on each aspects of material, color, dignity, item, military ornaments and accessories. During wartime, the military uniform improved its functionality and gave much influence on normal clothing at the same time either directly or indirectly. Military look became more diverse. In a mood for the end of century and inflated material civilization, and with nostalgia for the fast, mixed styles of fast, presents and future have come out in variety. In Street Fashion, there are many alternative trends to meet diverse desires of teenagers, and the military look has been steadily favored. The functionality and the decorativeness of military look would have met fashion sense and taste of younger generations pretty well. First, teenagers are active, and the practical materials and functional designs of military style applied to their clothes. Second, they prefer challenging and creative styles, and the decorative elements of military clothing for the colors, patterns, accessories have been applied to they clothing. We may need to understand their culture and emotion more closely and help them enjoy sound and beautiful clothing culture. The military uniform adapted itself to natural and social environments and has been developed and improved, which made that possible.