As a Taylor which is a sept of the Cameron Clan I would wear any of the Cameron Tartans with the exception of the Cameron of Lochiel (red and blue) which is restricted as Jock says to the Chief and his family. The hunting version (green and blue) is not restricted so, therefore would not cause any unnecessary faux pas at any Cameron gathering.

The safest bet is to wear the red and green (16 small green squares on a red background) which is the generally accepted Clan tartan.

If the mills will sell you the Cameron of Lochiel (restricted) then I think it probably says more about their willingness to sell you anything rather paying any due respect to Clan conventions.