Here is some USSR caps. I got the pics on my mail today, from a friend in Belarus who wants to sell out part of his huge USSR collection.
Soviet Panama hats from 1955
Peaked officers cap from 1969- Tank, Artillery, Engineers
Another 1969-1980 officers cap. Engineering armies, armies of communication, technical armies, road, building and pipeline parts. (Google translation)
The USSR - the Peak-cap Daily обр.1969 - the Ensign-tankman
Околыш - Cloth
Peak-cap from the daily form of ensigns and military men of extra urgent service.(Google trans)
And many more...