Isadora Duncan dancing. Approximately the begining of 1900s.Elvira studio of Munich.

Library of Congress. Elvira studio of Munich

It's a good thing when such photos become available in good quality.

Isadora Duncan standing on half- toe. Elvira Studio of Munich,1903.

(Courtesy Adams Amsterdam Auctions)

Lot 64: Unrecorded studio portrait of Isadora Duncan by Hof-atelier Elvira 

You can also see the other photo from this photo session here.

Isadora Duncan at the Erechtheion temple,1903.

Isadora Duncan in a Greek robe, London,1910.

The Dover Street Studios Ltd

Isadora Duncan postcard,1904.

 photo by  A.Gorska

 Note that Isadora's name was written on this  photo as "Josadora".

Isadora Duncan performing a classical Greek dance,circa 1905.

     

#3306956 / gettyimages.com

Isadora looking over the sholder,1912

It is not know for sure when Isadora  appeared in tunic with bare legs for the first time.
According to Peters Kurth Isadora A sensational life, it was around 1899. During the concert about 40 decorous ladies left the hall, confused by the uncovered limbs.
About this period of time she also wore somewhat like ballet costume that was made from the mother's lace curtains.

photographed by Jacob Schloss.Chicago,1899.

                                              

She used tunic not only because she was inspired by Greece,but because it didn't fetter her movements, the body was free and breathed. Also known, that Isadora use transparent tunic to show the beauty of body and its motion. The flawness of such clothes increased the effect too.