Unfortunately google translator is not very good so I do not understand most of your questions but
-strap is a cheap, no name one. It looks nice on the picture but in reality is not very good.
-The picture is one of the Chris Niedenthal. He was English man who felt in love in Polish girl and came from UK to comunistic Poland to live with her. He was a photographer. His pictures shows reality in comunistic countries - mainly in Poland but also in CCCP, DDR, CSRS and others. Some of them are very, very famous - you can see a few in the net.
The picture I have pasted shows the student of agriculture university during practices - such students were called by people who lived in the country (deep province) "Eves" because they showed so many nude bodies without a shame