Yuri,
First off, I don't believe you are overstepping any bounds here. Sadly there is no reasoable way for us to "find out" who the photographer was. And since no one is seeking monetary gain... It's all a moot point.
As a photographer myself, I would like photo credit to be attached to images whenever possible, but frequently it is not possible. Oh well.
As to the issue of the shirt... I found the same era garb/lace shirt in the photo gallery:
http://www.corfid.com/gl/picture_gallery03.htm