This looks very much like the work from the Phillipines.
the shirts made from this kind of fabric are known as barong tagalog.
if you go to wikipedia you will see a lot of information regarding these.
here is the description of the fabrics used.
"The finest shirts are made from a variety of indigenous fabrics. They have a sheer appearance and the best are custom embroidered in delicate folk patterns :
Piña fabric is hand-loomed from
pineapple leaf fibers. Traditional
piña weavers in the country, however, are dwindling, making the delicate piña cloth expensive and highly prized. They are used only for very formal events.
Jusi fabric is mechanically woven and was once made from
abacá or banana silk.
Banana fabric is another sheer fabric used in formal occasions. It comes from the
Visayan island of
Negros. Hand-woven from banana fibre, the embroidery on this type is usually of a geometric design."