This is a 14th century Kamis, which is a shirt worn under the coat. It is made out of cotton, with a plain weave. The height is 130cm, the width 219cm. It has tapered sleeves attached at the shoulder and pleats to highlight the waist. It is of rectangle and triangle (at the sides) construction.
Embroidered in black is a flowering tree, with leaves and two long-tailed birds. It uses chain and running stitch.
Persian Embroidery: a study in miniatures by Dinah Tackett.
Historic Needlework Resources.
14th C. Persian Cotton Kamis/Pirihan written by Sara Kuehn and hosted by Dar Anahita.
Islam in India and Pakistan by Annemarie Schimmel. It is a limited preview as it is Google Books.