Web sites about costumes (general): 

International Costumers' Guild, Inc. http://www.costume.org/

ISLAMIC COSTUMES SITES:
http://www.sfusd.k12.ca.us/schwww/sch618/islam/nbLinks/Islam_Clothing_Jewelry.html
(Check out the Women's headdresses in Traditional Turkish folklore, for example)
Here's a ton of traditional costumes from what looks like every country in the world! (Many show various draping styles - head dresses or main articles of clothing)
http://islamic-world.net/sister/menufashion.htm
Ah... here is the one - I found it! This has a better grouping of the pics:
http://www.geocities.com/TheTropics/Resort/2389/