http://dl.lib.brown.edu/repository2/repoman.php?verb=search&task=setup&colid=13&type=basic
Use 'Keyword(s)': Turkey.
The Vinkhuijzen collection of military uniforms (NYPL) seems to have expanded its available material:
http://digitalgallery.nypl.org/nypldigital/dgtitle_tree.cfm?level=1&title_id=269277
Click on 'Turkey'.