Below is an extract from the Cameron website which clearly sets out the different tartans and their restrictions or availability. -

TARTANS There are four basic tartans which are utilized by the Clan Cameron, each of which is usually found available in "modern" (bright and lively colors), "weathered" (softer hues) and "ancient" (supposedly more authentic colors) variations.

1) Basic Clan Cameron: This sixteen green squares upon a red background sett, with a bright yellow bordering, is for general use by all members of Clan Cameron. If one tartan had to be singled out for general use by Camerons worldwide, Basic Clan Cameron would be the one. As is the case with most clan tartans, this is one from the Vestiarium of Scoticum in 1834, which was accepted by the then Lochiel. It very much resembles an old red and green square sett in the West Highlands Museum in Fort William, although there are some variations.

2) Cameron of Lochiel: This red and blue tartan is similar to that worn by the 18th Chief, Donald "The Gentle Lochiel" Cameron in a portrait hanging at Achnacarry. It was first illustrated in 1810 in Wilson's Collection. This is the personal tartan of the Chief and his immediate family; as a rule it should not be worn by clansfolk.

3) Cameron of Erracht: Said to have been designed by the wife of Donald, 7th of Erracht in 1793 (there are many theories as to its origin, none of which seem entirely satisfactory). This combination of the Cameron and MacDonald tartans uses a deep red, dark blue, green and a fine gold line. It was created for the use of the original 79th Regiment, later known as The Queen's Own Cameron Highlanders, raised in 1793 by their eldest son, General Sir Allan Cameron, K.C.B. Regardless of its origin, this tartan has been in use by The Cameron Highlanders since their late-eighteenth century inception. It is often used as a day or "hunting" tartan, because of its "serviceable" colors. At times it has been strictly reserved for use among the regiment, but is now in wide use among Clan Cameron. This tartan was not created as a tribal clothing specifically for the Erracht Camerons. Therefore, if any Cameron ancestors owned this tartan, it does not mean that they were Camerons of Erracht. Quite the contrary, it probably indicates a regimental affiliation or even a school uniform, as some Highland academic institutions required students to dress in this tartan.

4) Hunting Cameron (of Lochiel): With its soft shades of green and blue, this tartan is not listed as being restricted in its use. It was devised because the Basic Clan Cameron tartan was considered too bright for shootings, stalking and hiking. Designed in 1956, it was based on a description of the tartan worn by the clansmen who fought under Sir Ewen Cameron, 17th Chief, at the battle of Killiecrankie

Personally as a sept member of the Cameron Clan I prefer the Hunting Cameron Tartan which is unrestricted in its use.

hope this helps