The norm for everyday costume in India and Indonesia had consisted of either draped garments or loincloths. However, as the Islamic values spread in these countries various tailored clothes began to be worn. In order to study this spread of tailored clothes, the researcher first looked at the historical background which was the origin of Islamic costumes and its unique traits through the works of literature. Based on these findings, the researcher tried to identify the Islamic elements in the costumes of India and Indonesia. The researcher put forward the following conclusion: In India, people began to wear Islamic costumes after the establishment of Mughul Empire (1526~1857) in the 16th century, despite the Islamic invasion in the early 8th century. The pants that the ruling class of Islam wore such as shalwar, churidar and coats in the style of kaftan as well as turban spread quickly throughout the nation and now they are important part of Indian traditional costumes. Also in Indonesia, people began to wear tailored clothes as they accepted Islamic faith. The Indonesian costumes which exposed the upper body part may have been suitable for the climate but it was inappropriate according to the Islamic precepts. The religious beliefs led to the creation of the unique Indonesian sarong, wraps such as kain panjang and a new type of traditional costumes that combined the elements of pants or tunic from the Islamic culture.