Uniforms need to be tough to support hard works of post officers in height.
1 January 1940 / Belgrade Postal Employees' Fund / Telegraph linesman / design: V. Andrejevic
5 November 1947 / Postal Employees' Relief Fund / Lineman / design: D. Gyudzhenov
15 December 1951 / Six Year Plan: Electrification / Installing Electric Cable (looks like Telegraph line, though?)
27 September 1990 / Humanitarian Relief Funds: Posts and Telecommunications / design: P. Steiner