Blimey! There's a lot of them isn't there. You CAN wear whatever tartan you like, but be mindful that it is a sensitive issue with some and so long as you have a reasonable understanding of the tartan and it's background and you wear it in a dignified and respectful manner I'm sure no-one will really mind. Particularly in Australia where I'm given to understand Kilties are not common. (or so my good mate Shane in Darwin tells me).