I found this interesting picture on the Clan Cameron site


The caption reads:
1972:Colonel Sir Donald Hamish Cameron of Lochiel, K.T., XXVI Chief of Clan Cameron (third from right) along with the Standing Council of Scottish Chiefs, at the 1972 International Gathering of the Clans, which took place at the Royal Highland Show in Ingliston, Scotland

There appears to be white hose in that photo. So I guess it was prior to 1972 that white hose started to be come popular or available.
Sara