Presidential and Prime Ministerial Sashes

A presidential sash is a cloth sash worn by presidents of many nations in the world. Such sashes are worn by presidents in Africa, Asia, Europe, and most notably, in Latin America. Presidential sashes are usually very colorful, and designed to resemble the nation's flag. Source: http://en.wikipedia.org/wiki/Presidential_sash

Almost every nation has some form of decorative sash as one of its highest military awards. This is a tradition that dates back to at least the 15th century.
Source: http://www.filibustercartoons.com/pictessays_leaders_pres.php

For a set of Presidential sashes around the world please see:
http://en.wikipedia.org/wiki/Presidential_sash
http://es.wikipedia.org/wiki/Banda_Presidencial
http://www.filibustercartoons.com/pictessays_leaders_pres.php
Esteban Rivera, 2 September 2010

Sashes are used not only military awards (or indeed the highest category of civilian awards). In the UK the award of a Knighthood in one of several Orders (the Order of The Bath, of St Michael and St George, of The Royal Victorian Order, etc.) carries with it the right to wear a sash (called colloquially a "ribbon").

Presidential and civic sashes generally use the relevant national colours and (possibly) coat of arms.
Christopher Southworth, 2 September 2010

Also, there are other Executive entities who have a sash, but are not either Presidents or Prime Minister like the following:
Córdoba Department, Colombia, Governor sash
Esteban Rivera, 13 March 2013