Samarkand, the capitol city of Sogdia, located in Western Turkestan (modern-day Uzbekistan) was part of the Persian Empire throughout most of history. In 1965, a wall painting depicting a court scene was discovered. The bright colors and detail make it an excellent place to begin the study of costume. When one studies the paintings from Samarkand, you are struck by the similarity to Persian costuming throughout the ages.
Sergey A. Yatsenko wrote an excellent paper studying the costumes shown in the murals. His treatise is located here. Please note, this will take you out of my site.
The following images are from various paintings in Sogdia. As you look through them, note that the clothing does not appear to change signficantly over time.
Tribute Bearers, 600-650 AD
King Varkhuman, 7th Century AD
Nobleman Hunting with His Dogs, Sogdia, 740 AD
Four Noblewoman 8th/9th Century
Warrior 8th/9th Century
Princely Gathering 11th Century