Testing demonstrates very little actual temperature difference in color, and indeed desert peoples from north african salt caravanseri to arabian bedu dress in dark blues,blacks and browns to the white of T.E. Lawrence. The cooling trick is multiple light layers to trap cooler air. Bandannas etc are usually in bright colors for signalling, but anything that stands out from the natural terrain will work. International orange does me precious little good when the California poppies are in full bloom <img src="images/graemlins/grin.gif" alt="" /> my largest silk bandanna is a full 42"x42", smaller than many shemaghs and still to big to slip into smaller pockets. Finally, remember this is a traditional piece of clothing. In California I buy my Gas from a Persian, lunch from a Gujarti Indian and hay from a Sikhe. I wear a shemagh and I get shown 6 traditional ways of draping the thing <img src="images/graemlins/blush.gif" alt="" /> I WILL NOT be buying Austrian Lederholsen for 3 years <img src="images/graemlins/tongue.gif" alt="" />